2 * Internal header for libusb
3 * Copyright (C) 2007 Daniel Drake <dsd@gentoo.org>
4 * Copyright (c) 2001 Johannes Erdfelt <johannes@erdfelt.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include <sys/select.h>
33 #define DEVICE_DESC_LENGTH 18
35 #define USB_MAXENDPOINTS 32
36 #define USB_MAXINTERFACES 32
37 #define USB_MAXCONFIG 8
40 struct list_head *prev, *next;
43 /* Get an entry from the list
44 * ptr - the address of this list_head element in "type"
45 * type - the data type that contains "member"
46 * member - the list_head element in "type"
48 #define list_entry(ptr, type, member) \
49 ((type *)((char *)(ptr) - (unsigned long)(&((type *)0L)->member)))
51 /* Get each entry from a list
52 * pos - A structure pointer has a "member" element
54 * member - the list_head element in "pos"
56 #define list_for_each_entry(pos, head, member) \
57 for (pos = list_entry((head)->next, typeof(*pos), member); \
58 &pos->member != (head); \
59 pos = list_entry(pos->member.next, typeof(*pos), member))
61 #define list_for_each_entry_safe(pos, n, head, member) \
62 for (pos = list_entry((head)->next, typeof(*pos), member), \
63 n = list_entry(pos->member.next, typeof(*pos), member); \
64 &pos->member != (head); \
65 pos = n, n = list_entry(n->member.next, typeof(*n), member))
67 #define list_empty(entry) ((entry)->next == (entry))
69 static inline void list_init(struct list_head *entry)
71 entry->prev = entry->next = entry;
74 static inline void list_add(struct list_head *entry, struct list_head *head)
76 entry->next = head->next;
79 head->next->prev = entry;
83 static inline void list_add_tail(struct list_head *entry,
84 struct list_head *head)
87 entry->prev = head->prev;
89 head->prev->next = entry;
93 static inline void list_del(struct list_head *entry)
95 entry->next->prev = entry->prev;
96 entry->prev->next = entry->next;
99 #define container_of(ptr, type, member) ({ \
100 const typeof( ((type *)0)->member ) *__mptr = (ptr); \
101 (type *)( (char *)__mptr - offsetof(type,member) );})
103 #define bswap16(x) (((x & 0xff) << 8) | (x >> 8))
104 #if __BYTE_ORDER == __LITTLE_ENDIAN
105 #define cpu_to_le16(x) (x)
106 #define le16_to_cpu(x) (x)
107 #elif __BYTE_ORDER == __BIG_ENDIAN
108 #define le16_to_cpu(x) bswap16(x)
109 #define cpu_to_le16(x) bswap16(x)
111 #error "Unrecognized endianness"
114 #define MIN(a, b) ((a) < (b) ? (a) : (b))
115 #define MAX(a, b) ((a) > (b) ? (a) : (b))
117 #define TIMESPEC_IS_SET(ts) ((ts)->tv_sec != 0 || (ts)->tv_nsec != 0)
119 enum usbi_log_level {
126 void usbi_log(enum usbi_log_level, const char *function, const char *format, ...);
128 #ifdef ENABLE_LOGGING
129 #define _usbi_log(level, fmt...) usbi_log(level, __FUNCTION__, fmt)
131 #define _usbi_log(level, fmt...)
134 #ifdef ENABLE_DEBUG_LOGGING
135 #define usbi_dbg(fmt...) _usbi_log(LOG_LEVEL_DEBUG, fmt)
137 #define usbi_dbg(fmt...)
140 #define usbi_info(fmt...) _usbi_log(LOG_LEVEL_INFO, fmt)
141 #define usbi_warn(fmt...) _usbi_log(LOG_LEVEL_WARNING, fmt)
142 #define usbi_err(fmt...) _usbi_log(LOG_LEVEL_ERROR, fmt)
144 struct libusb_device {
145 struct list_head list;
147 unsigned long session_data;
148 struct libusb_device_descriptor desc;
149 struct libusb_config_descriptor *config;
150 unsigned char os_priv[0];
153 struct libusb_device_handle {
154 struct list_head list;
155 struct libusb_device *dev;
156 unsigned char os_priv[0];
159 #define USBI_TRANSFER_SYNC_CANCELLED (1<<0)
160 #define USBI_TRANSFER_TIMED_OUT (1<<1)
162 /* in-memory transfer layout:
164 * 1. struct usbi_transfer
165 * 2. struct libusb_transfer (which includes iso packets) [variable size]
166 * 3. os private data [variable size]
168 * from a libusb_transfer, you can get the usbi_transfer by rewinding the
169 * appropriate number of bytes.
170 * the usbi_transfer includes the number of allocated packets, so you can
171 * determine the size of the transfer and hence the start and length of the
175 struct usbi_transfer {
177 struct list_head list;
178 struct timeval timeout;
183 #define __USBI_TRANSFER_TO_LIBUSB_TRANSFER(transfer) \
184 ((struct libusb_transfer *)(((void *)(transfer)) \
185 + sizeof(struct usbi_transfer)))
186 #define __LIBUSB_TRANSFER_TO_USBI_TRANSFER(transfer) \
187 ((struct usbi_transfer *)(((void *)(transfer)) \
188 - sizeof(struct usbi_transfer)))
190 static inline void *usbi_transfer_get_os_priv(struct usbi_transfer *transfer)
192 return ((void *)transfer) + sizeof(struct usbi_transfer)
193 + sizeof(struct libusb_transfer)
194 + (transfer->num_iso_packets
195 * sizeof(struct libusb_iso_packet_descriptor));
200 /* All standard descriptors have these 2 fields in common */
201 struct usb_descriptor_header {
203 uint8_t bDescriptorType;
206 /* shared data and functions */
208 extern struct list_head usbi_open_devs;
210 void usbi_io_init(void);
212 struct libusb_device *usbi_alloc_device(unsigned long session_id);
213 struct libusb_device *usbi_get_device_by_session_id(unsigned long session_id);
215 void usbi_handle_transfer_completion(struct usbi_transfer *itransfer,
216 enum libusb_transfer_status status);
217 void usbi_handle_transfer_cancellation(struct usbi_transfer *transfer);
219 int usbi_parse_descriptor(unsigned char *source, char *descriptor, void *dest);
220 int usbi_parse_configuration(struct libusb_config_descriptor *config,
221 unsigned char *buffer);
226 /* must come first */
227 struct libusb_pollfd pollfd;
229 struct list_head list;
232 int usbi_add_pollfd(int fd, short events);
233 void usbi_remove_pollfd(int fd);
235 /* device discovery */
237 /* we traverse usbfs without knowing how many devices we are going to find.
238 * so we create this discovered_devs model which is similar to a linked-list
239 * which grows when required. it can be freed once discovery has completed,
240 * eliminating the need for a list node in the libusb_device structure
242 struct discovered_devs {
245 struct libusb_device *devices[0];
248 struct discovered_devs *discovered_devs_append(
249 struct discovered_devs *discdevs, struct libusb_device *dev);
253 struct usbi_os_backend {
258 int (*get_device_list)(struct discovered_devs **discdevs);
260 int (*open)(struct libusb_device_handle *handle);
261 void (*close)(struct libusb_device_handle *handle);
263 int (*claim_interface)(struct libusb_device_handle *handle, int iface);
264 int (*release_interface)(struct libusb_device_handle *handle, int iface);
266 int (*set_interface_altsetting)(struct libusb_device_handle *handle,
267 int iface, int altsetting);
269 void (*destroy_device)(struct libusb_device *dev);
271 int (*submit_transfer)(struct usbi_transfer *itransfer);
272 int (*cancel_transfer)(struct usbi_transfer *itransfer);
274 int (*handle_events)(fd_set *readfds, fd_set *writefds);
276 /* number of bytes to reserve for libusb_device.os_priv */
277 size_t device_priv_size;
279 /* number of bytes to reserve for libusb_device_handle.os_priv */
280 size_t device_handle_priv_size;
282 /* number of bytes to reserve for usbi_transfer.os_priv */
283 size_t transfer_priv_size;
285 /* number of additional bytes for os_priv for each iso packet */
286 size_t add_iso_packet_size;
289 extern const struct usbi_os_backend * const usbi_backend;
291 extern const struct usbi_os_backend linux_usbfs_backend;