1 /*
2 * Copyright (c) 2009 François Revol, <revol@free.fr>.
3 *
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify,
8 * merge, publish, distribute, sublicense, and/or sell copies of
9 * the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
17 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
19 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
20 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 #include <KernelExport.h>
26 #include <Drivers.h>
27 #include <Errors.h>
28
29 int32 api_version = B_CUR_DRIVER_API_VERSION;
30 static int32 sOpenMask;
31
32 status_t
init_hardware(void)33 init_hardware(void)
34 {
35 dprintf("kdl: init_hardware\n");
36 return B_OK;
37 }
38
39
40 status_t
init_driver(void)41 init_driver(void)
42 {
43 dprintf("kdl: init_driver\n");
44 return B_OK;
45 }
46
47
48 void
uninit_driver(void)49 uninit_driver(void)
50 {
51 dprintf("kdl: uninit_driver\n");
52 }
53
54
55 static status_t
driver_open(const char * name,uint32 flags,void ** _cookie)56 driver_open(const char *name, uint32 flags, void** _cookie)
57 {
58 dprintf("kdl: open\n");
59
60 // TODO: check for proper credencials! (root only ?)
61
62 if (atomic_or(&sOpenMask, 1)) {
63 dprintf("kdl: open, BUSY!\n");
64 return B_BUSY;
65 }
66
67 dprintf("kdl: open, success\n");
68 return B_OK;
69 }
70
71
72 static status_t
driver_close(void * cookie)73 driver_close(void* cookie)
74 {
75 dprintf("kdl: close enter\n");
76 dprintf("kdl: close leave\n");
77 return B_OK;
78 }
79
80
81 static status_t
driver_free(void * cookie)82 driver_free(void* cookie)
83 {
84 dprintf("kdl: free\n");
85 atomic_and(&sOpenMask, ~1);
86 return B_OK;
87 }
88
89
90 static status_t
driver_read(void * cookie,off_t position,void * buf,size_t * num_bytes)91 driver_read(void* cookie, off_t position, void *buf, size_t* num_bytes)
92 {
93 dprintf("kdl: read\n");
94 panic("requested from kdl driver.");
95 *num_bytes = 0; // nothing to read
96 return B_ERROR;
97 }
98
99
100 static status_t
driver_write(void * cookie,off_t position,const void * buffer,size_t * num_bytes)101 driver_write(void* cookie, off_t position, const void* buffer, size_t* num_bytes)
102 {
103 dprintf("kdl: write\n");
104 *num_bytes = 1; // pretend 1 byte was written
105 return B_OK;
106 }
107
108
109 static status_t
driver_control(void * cookie,uint32 op,void * arg,size_t len)110 driver_control(void *cookie, uint32 op, void *arg, size_t len)
111 {
112 dprintf("kdl: control\n");
113 return B_ERROR;
114 }
115
116
117 const char**
publish_devices(void)118 publish_devices(void)
119 {
120 static const char *names[] = {"misc/kdl", NULL};
121 dprintf("kdl: publish_devices\n");
122 return names;
123 }
124
125
126 device_hooks*
find_device(const char * name)127 find_device(const char* name)
128 {
129 static device_hooks hooks = {
130 driver_open,
131 driver_close,
132 driver_free,
133 driver_control,
134 driver_read,
135 driver_write,
136 };
137 dprintf("kdl: find_device\n");
138 return &hooks;
139 }
140
141