1 .\" $NetBSD: usb.3,v 1.13 2000/09/24 02:17:52 augustss Exp $
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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 ,
44 .Nm hid_parse_usage_page ,
45 .Nm hid_parse_usage_in_page ,
49 .Nd USB HID access routines
55 .Fn hid_get_report_desc "int file"
57 .Fn hid_use_report_desc "unsigned char *data" "unsigned int size"
59 .Fn hid_dispose_report_desc "report_desc_t d"
61 .Fn hid_start_parse "report_desc_t d" "int kindset"
63 .Fn hid_end_parse "hid_data_t s"
65 .Fn hid_get_item "hid_data_t s" "hid_item_t *h"
67 .Fn hid_report_size "report_desc_t d" "unsigned int id" "hid_kind_t k"
69 .Fn hid_locate "report_desc_t d" "unsigned int usage" "hid_kind_t k" "hid_item_t *h"
71 .Fn hid_usage_page "int i"
73 .Fn hid_usage_in_page "unsigned int u"
75 .Fn hid_parse_usage_page "const char *name"
77 .Fn hid_parse_usage_in_page "const char *name"
79 .Fn hid_init "const char *file"
81 .Fn hid_get_data "const void *data" "const hid_item_t *h"
83 .Fn hid_set_data "void *p" "const hid_item_t *h" "int data"
87 library provides routines to extract data from USB Human Interface Devices.
89 USB HID devices send and receive data laid out in a device dependent
92 library contains routines to extract the
94 which contains the data layout information and then use this information.
96 The routines can be divided into four parts: extraction of the descriptor,
97 parsing of the descriptor, translating to/from symbolic names, and
99 .Ss DESCRIPTOR FUNCTIONS
100 A report descriptor can be obtained by calling
101 .Fn hid_get_report_desc
102 with a file descriptor obtained by opening a
104 device. Alternatively a data buffer containing the report descriptor can be
106 .Fn hid_use_report_desc .
107 The data is copied into an internal structure. When the report descriptor
108 is no longer needed it should be freed by calling
109 .Fn hid_dispose_report_desc .
112 is opaque and should be used when calling the parsing functions.
114 .Fn hid_dispose_report_desc
117 .Ss DESCRIPTOR PARSING FUNCTIONS
118 To parse the report descriptor the
120 function should be called with a report descriptor and a set that
121 describes which items that are interesting. The set is obtained
122 by or-ing together values
130 if the initialization fails, otherwise an opaque value to be used
134 function should be called to free internal data structures.
136 To iterate through all the items in the report descriptor
138 should be called while it returns a value greater than 0.
139 When the report descriptor ends it will returns 0; a syntax
140 error within the report descriptor will cause a return value less
142 The struct pointed to by
144 will be filled with the relevant data for the item.
149 and the meaning of the components in the USB HID documentation.
151 Data should be read/written to the device in the size of
152 the report. The size of a report (of a certain kind) can be
157 To locate a single item the
159 function can be used. It should be given the usage code of
160 the item and its kind and it will fill the item and return
161 non-zero if the item was found.
162 .Ss NAME TRANSLATION FUNCTIONS
165 will return the symbolic name of a usage page, and the function
166 .Fn hid_usage_in_page
167 will return the symbolic name of the usage within the page.
168 Both these functions may return a pointer to static data.
171 .Fn hid_parse_usage_page
173 .Fn hid_parse_usage_in_page
177 .Fn hid_usage_in_page .
178 They take a usage string and return the number of the usage, or -1
179 if it cannot be found.
181 Before any of these functions can be called the usage table
182 must be parsed, this is done by calling
184 with the name of the table. Passing
186 to this function will cause it to use the default table.
187 .Ss DATA EXTRACTION FUNCTIONS
188 Given the data obtained from a HID device and an item in the
189 report descriptor the
191 function extracts the value of the item.
194 can be used to put data into a report (which must be zeroed first).
196 .Pa /usr/share/misc/usb_hid_usages
197 The default HID usage table.
203 specifications can be found at
204 .Pa http://www.usb.org/developers/docs.htm .
211 library first appeared in
214 This man page is woefully incomplete.