1/* 2 * Copyright (c) 2009 Fran��ois 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 29int32 api_version = B_CUR_DRIVER_API_VERSION; 30static int32 sOpenMask; 31 32status_t 33init_hardware(void) 34{ 35 dprintf("kdl: init_hardware\n"); 36 return B_OK; 37} 38 39 40status_t 41init_driver(void) 42{ 43 dprintf("kdl: init_driver\n"); 44 return B_OK; 45} 46 47 48void 49uninit_driver(void) 50{ 51 dprintf("kdl: uninit_driver\n"); 52} 53 54 55static status_t 56driver_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 72static status_t 73driver_close(void* cookie) 74{ 75 dprintf("kdl: close enter\n"); 76 dprintf("kdl: close leave\n"); 77 return B_OK; 78} 79 80 81static status_t 82driver_free(void* cookie) 83{ 84 dprintf("kdl: free\n"); 85 atomic_and(&sOpenMask, ~1); 86 return B_OK; 87} 88 89 90static status_t 91driver_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 100static status_t 101driver_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 109static status_t 110driver_control(void *cookie, uint32 op, void *arg, size_t len) 111{ 112 dprintf("kdl: control\n"); 113 return B_ERROR; 114} 115 116 117const char** 118publish_devices(void) 119{ 120 static const char *names[] = {"misc/kdl", NULL}; 121 dprintf("kdl: publish_devices\n"); 122 return names; 123} 124 125 126device_hooks* 127find_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