include/linux/usb/functionfs.h

   1 #ifndef __LINUX_FUNCTIONFS_H__
   2 #define __LINUX_FUNCTIONFS_H__ 1
   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 };
  15
  16
  17 #ifndef __KERNEL__
  18
  19 /* Descriptor of an non-audio endpoint */
  20 struct usb_endpoint_descriptor_no_audio {
  21         __u8  bLength;
  22         __u8  bDescriptorType;
  23
  24         __u8  bEndpointAddress;
  25         __u8  bmAttributes;
  26         __le16 wMaxPacketSize;
  27         __u8  bInterval;
  28 } __attribute__((packed));
  29
  30
  31 /*
  32  * All numbers must be in little endian order.
  33  */
  34
  35 struct usb_functionfs_descs_head {
  36         __le32 magic;
  37         __le32 length;
  38         __le32 fs_count;
  39         __le32 hs_count;
  40 } __attribute__((packed));
  41
  42 /*
  43  * Descriptors format:
  44  *
  45  * | off | name      | type         | description                          |
  46  * |-----+-----------+--------------+--------------------------------------|
  47  * |   0 | magic     | LE32         | FUNCTIONFS_{FS,HS}_DESCRIPTORS_MAGIC |
  48  * |   4 | length    | LE32         | length of the whole data chunk       |
  49  * |   8 | fs_count  | LE32         | number of full-speed descriptors     |
  50  * |  12 | hs_count  | LE32         | number of high-speed descriptors     |
  51  * |  16 | fs_descrs | Descriptor[] | list of full-speed descriptors       |
  52  * |     | hs_descrs | Descriptor[] | list of high-speed descriptors       |
  53  *
  54  * descs are just valid USB descriptors and have the following format:
  55  *
  56  * | off | name            | type | description              |
  57  * |-----+-----------------+------+--------------------------|
  58  * |   0 | bLength         | U8   | length of the descriptor |
  59  * |   1 | bDescriptorType | U8   | descriptor type          |
  60  * |   2 | payload         |      | descriptor's payload     |
  61  */
  62
  63 struct usb_functionfs_strings_head {
  64         __le32 magic;
  65         __le32 length;
  66         __le32 str_count;
  67         __le32 lang_count;
  68 } __attribute__((packed));
  69
  70 /*
  71  * Strings format:
  72  *
  73  * | off | name       | type                  | description                |
  74  * |-----+------------+-----------------------+----------------------------|
  75  * |   0 | magic      | LE32                  | FUNCTIONFS_STRINGS_MAGIC   |
  76  * |   4 | length     | LE32                  | length of the data chunk   |
  77  * |   8 | str_count  | LE32                  | number of strings          |
  78  * |  12 | lang_count | LE32                  | number of languages        |
  79  * |  16 | stringtab  | StringTab[lang_count] | table of strings per lang  |
  80  *
  81  * For each language there is one stringtab entry (ie. there are lang_count
  82  * stringtab entires).  Each StringTab has following format:
  83  *
  84  * | off | name    | type              | description                        |
  85  * |-----+---------+-------------------+------------------------------------|
  86  * |   0 | lang    | LE16              | language code                      |
  87  * |   2 | strings | String[str_count] | array of strings in given language |
  88  *
  89  * For each string there is one strings entry (ie. there are str_count
  90  * string entries).  Each String is a NUL terminated string encoded in
  91  * UTF-8.
  92  */
  93
  94 #endif
  95
  96
  97 /*
  98  * Events are delivered on the ep0 file descriptor, when the user mode driver
  99  * reads from this file descriptor after writing the descriptors.  Don't
 100  * stop polling this descriptor.
 101  */
 102
 103 enum usb_functionfs_event_type {
 104         FUNCTIONFS_BIND,
 105         FUNCTIONFS_UNBIND,
 106
 107         FUNCTIONFS_ENABLE,
 108         FUNCTIONFS_DISABLE,
 109
 110         FUNCTIONFS_SETUP,
 111
 112         FUNCTIONFS_SUSPEND,
 113         FUNCTIONFS_RESUME
 114 };
 115
 116 /* NOTE:  this structure must stay the same size and layout on
 117  * both 32-bit and 64-bit kernels.
 118  */
 119 struct usb_functionfs_event {
 120         union {
 121                 /* SETUP: packet; DATA phase i/o precedes next event
 122                  *(setup.bmRequestType & USB_DIR_IN) flags direction */
 123                 struct usb_ctrlrequest  setup;
 124         } __attribute__((packed)) u;
 125
 126         /* enum usb_functionfs_event_type */
 127         __u8                            type;
 128         __u8                            _pad[3];
 129 } __attribute__((packed));
 130
 131
 132 /* Endpoint ioctls */
 133 /* The same as in gadgetfs */
 134
 135 /* IN transfers may be reported to the gadget driver as complete
 136  *      when the fifo is loaded, before the host reads the data;
 137  * OUT transfers may be reported to the host's "client" driver as
 138  *      complete when they're sitting in the FIFO unread.
 139  * THIS returns how many bytes are "unclaimed" in the endpoint fifo
 140  * (needed for precise fault handling, when the hardware allows it)
 141  */
 142 #define FUNCTIONFS_FIFO_STATUS  _IO('g', 1)
 143
 144 /* discards any unclaimed data in the fifo. */
 145 #define FUNCTIONFS_FIFO_FLUSH   _IO('g', 2)
 146
 147 /* resets endpoint halt+toggle; used to implement set_interface.
 148  * some hardware (like pxa2xx) can't support this.
 149  */
 150 #define FUNCTIONFS_CLEAR_HALT   _IO('g', 3)
 151
 152 /* Specific for functionfs */
 153
 154 /*
 155  * Returns reverse mapping of an interface.  Called on EP0.  If there
 156  * is no such interface returns -EDOM.  If function is not active
 157  * returns -ENODEV.
 158  */
 159 #define FUNCTIONFS_INTERFACE_REVMAP     _IO('g', 128)
 160
 161 /*
 162  * Returns real bEndpointAddress of an endpoint.  If function is not
 163  * active returns -ENODEV.
 164  */
 165 #define FUNCTIONFS_ENDPOINT_REVMAP      _IO('g', 129)
 166
 167
 168 #ifdef __KERNEL__
 169
 170 struct ffs_data;
 171 struct usb_composite_dev;
 172 struct usb_configuration;
 173
 174
 175 static int  functionfs_init(void) __attribute__((warn_unused_result));
 176 static void functionfs_cleanup(void);
 177
 178 static int functionfs_bind(struct ffs_data *ffs, struct usb_composite_dev *cdev)
 179         __attribute__((warn_unused_result, nonnull));
 180 static void functionfs_unbind(struct ffs_data *ffs)
 181         __attribute__((nonnull));
 182
 183 static int functionfs_bind_config(struct usb_composite_dev *cdev,
 184                                   struct usb_configuration *c,
 185                                   struct ffs_data *ffs)
 186         __attribute__((warn_unused_result, nonnull));
 187
 188
 189 static int functionfs_ready_callback(struct ffs_data *ffs)
 190         __attribute__((warn_unused_result, nonnull));
 191 static void functionfs_closed_callback(struct ffs_data *ffs)
 192         __attribute__((nonnull));
 193 static int functionfs_check_dev_callback(const char *dev_name)
 194         __attribute__((warn_unused_result, nonnull));
 195
 196
 197 #endif
 198
 199 #endif