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34 .Nm hid_get_report_desc ,
35 .Nm hid_use_report_desc ,
36 .Nm hid_dispose_report_desc ,
43 .Nm hid_usage_in_page ,
47 .Nd USB HID access routines
53 .Fn hid_get_report_desc "int file"
55 .Fn hid_use_report_desc "unsigned char *data" "unsigned int size"
57 .Fn hid_dispose_report_desc "report_desc_t d"
59 .Fn hid_start_parse "report_desc_t d" "int kindset"
61 .Fn hid_end_parse "hid_data_t s"
63 .Fn hid_get_item "hid_data_t s" "hid_item_t *h"
65 .Fn hid_report_size "report_desc_t d" "unsigned int id" "hid_kind_t k"
67 .Fn hid_locate "report_desc_t d" "unsigned int usage" "hid_kind_t k" "hid_item_t *h"
69 .Fn hid_usage_page "int i"
71 .Fn hid_usage_in_page "unsigned int u"
73 .Fn hid_parse_usage_page "const char *name"
75 .Fn hid_parse_usage_in_page "const char *name"
77 .Fn hid_init "const char *file"
79 .Fn hid_get_data "const void *data" "const hid_item_t *h"
81 .Fn hid_set_data "void *p" "const hid_item_t *h" "int data"
85 library provides routines to extract data from USB Human Interface Devices.
87 USB HID devices send and receive data layed out in a device dependent
90 library contains routines to extract the
92 which contains the data layout information and then use this information.
94 The routines can be divided into four parts: extraction of the descriptor,
95 parsing of the descriptor, translating to/from symbolic names, and
97 .Ss DESCRIPTOR FUNCTIONS
98 A report descriptor can be obtained by calling
99 .Fn hid_get_report_desc
100 with a file descriptor obtained by opening a
102 device. Alternatively a data buffer containing the report descriptor can be
104 .Fn hid_use_report_desc .
105 The data is copied into an internal structure. When the report descriptor
106 is no longer needed it should be freed by calling
107 .Fn hid_dispose_report_desc .
110 is opaque and should be used when calling the parsing functions.
112 .Fn hid_dispose_report_desc
115 .Ss DESCRIPTOR PARSING FUNCTIONS
116 To parse the report descriptor the
118 function should be called with a report descriptor and a set that
119 describes which items that are interesting. The set is obtained
120 by or-ing together values
128 if the initialization fails, otherwise an opaque value to be used
132 function should be called to free internal data structures.
134 To iterate through all the items in the report descriptor
136 should be called while it returns a value greater than 0.
137 When the report descriptor ends it will returns 0; a syntax
138 error within the report descriptor will cause a return value less
140 The struct pointed to by
142 will be filled with the relevant data for the item.
147 and the meaning of the components in the USB HID documentation.
149 Data should be read/written to the device in the size of
150 the report. The size of a report (of a certain kind) can be
155 To locate a single item the
157 function can be used. It should be given the usage code of
158 the item and its kind and it will fill the item and return
159 non-zero if the item was found.
160 .Ss NAME TRANSLATION FUNCTIONS
163 will return the symbolic name of a usage page, and the function
164 .Fn hid_usage_in_page
165 will return the symbolic name of the usage within the page.
166 Both these functions may return a pointer to static data.
169 .Fn hid_parse_usage_page
171 .Fn hid_parse_usage_in_page
175 .Fn hid_usage_in_page .
176 They take a usage string and return the number of the usage, or -1
177 if it cannot be found.
179 Before any of these functions can be called the usage table
180 must be parsed, this is done by calling
182 with the name of the table. Passing
184 to this function will cause it to use the default table.
185 .Ss DATA EXTRACTION FUNCTIONS
186 Given the data obtained from a HID device and an item in the
187 report descriptor the
189 function extracts the value of the item.
192 can be used to put data into a report (which must be zeroed first).
194 .Pa /usr/share/misc/usb_hid_usages
195 The default HID usage table.
201 specifications can be found at
202 .Dv http://www.usb.org/developers/docs.htm .
209 library first appeared in
212 This man page is woefully incomplete.