lincan/src/main.c

   1 /* main.c
   2  * Linux CAN-bus device driver.
   3  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
   4  * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
   5  * email:pisa@cmp.felk.cvut.cz
   6  * This software is released under the GPL-License.
   7  * Version lincan-0.2  9 Jul 2003
   8  */
   9
  10 #define EXPORT_SYMTAB
  11
  12 #include <linux/autoconf.h>
  13
  14 #include <linux/module.h>
  15
  16 #include <linux/kernel.h>
  17 #include <linux/fs.h>
  18 #include <linux/sched.h>
  19 #include <linux/poll.h>
  20 #include <linux/version.h>
  21 #include <linux/autoconf.h>
  22 #include <linux/interrupt.h>
  23
  24 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
  25 #include <linux/wrapper.h>
  26 #endif
  27
  28 #if !defined (__GENKSYMS__)
  29 #if (defined (MODVERSIONS) && !defined(NOVER))
  30 #include <linux/modversions.h>
  31 /*#include "../include/main.ver"*/
  32 #endif
  33 #endif
  34
  35 /*#undef CONFIG_DEVFS_FS*/
  36
  37 #ifdef CONFIG_DEVFS_FS
  38 #include <linux/devfs_fs_kernel.h>
  39 #include <linux/miscdevice.h>
  40 #endif
  41
  42 #include "../include/can.h"
  43 #include "../include/can_sysdep.h"
  44 #include "../include/main.h"
  45 #include "../include/modparms.h"
  46 #include "../include/devcommon.h"
  47 #include "../include/setup.h"
  48 #include "../include/proc.h"
  49 #include "../include/open.h"
  50 #include "../include/close.h"
  51 #include "../include/read.h"
  52 #include "../include/select.h"
  53 #include "../include/irq.h"
  54 #include "../include/ioctl.h"
  55 #include "../include/write.h"
  56 #include "../include/finish.h"
  57 #include "../include/fasync.h"
  58
  59 #ifdef CAN_WITH_RTL
  60 #include <rtl_posixio.h>
  61 #include "../include/can_iortl.h"
  62 #endif /*CAN_WITH_RTL*/
  63
  64 #define EXPORT_SYMTAB
  65
  66 can_spinlock_t canuser_manipulation_lock;
  67
  68 /* Module parameters, some must be supplied at module loading time */
  69 int major=CAN_MAJOR;
  70 MODULE_PARM(major,"1i");
  71 int minor[MAX_TOT_CHIPS]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
  72 /*MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");*/
  73 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  74 int extended=0;
  75 MODULE_PARM(extended,"1i");
  76 int pelican=0;
  77 MODULE_PARM(pelican,"1i");
  78 int baudrate[MAX_TOT_CHIPS];
  79 MODULE_PARM(baudrate, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  80 char *hw[MAX_HW_CARDS]={NULL,};
  81 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  82 int irq[MAX_IRQ]={-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1};
  83 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  84 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  85 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  86 int stdmask=0;
  87 MODULE_PARM(stdmask, "1i");
  88 int extmask=0;
  89 MODULE_PARM(extmask, "1i");
  90 int mo15mask=0;
  91 MODULE_PARM(mo15mask, "1i");
  92 int processlocal=0;
  93 MODULE_PARM(processlocal, "1i");
  94
  95 /* Other module attributes */
  96 #ifdef MODULE_SUPPORTED_DEVICE
  97 MODULE_SUPPORTED_DEVICE("can");
  98 #endif
  99 #ifdef MODULE_LICENSE
 100 MODULE_LICENSE("GPL");
 101 #endif
 102 #ifdef MODULE_DESCRIPTION
 103 MODULE_DESCRIPTION("Universal Linux CAN-bus device driver");
 104 #endif
 105
 106 /* Global structures, used to describe the installed hardware. */
 107 struct canhardware_t canhardware;
 108 struct canhardware_t *hardware_p=&canhardware;
 109 struct chip_t *chips_p[MAX_TOT_CHIPS];
 110 struct msgobj_t *objects_p[MAX_TOT_MSGOBJS];
 111 #ifdef CONFIG_DEVFS_FS
 112 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,60))
 113 devfs_handle_t  devfs_handles[MAX_TOT_MSGOBJS];
 114 #endif
 115 #endif
 116
 117 /* Pointers to dynamically allocated memory are maintained in a linked list
 118  * to ease memory deallocation.
 119  */
 120 struct mem_addr *mem_head=NULL;
 121
 122 struct file_operations can_fops=
 123 {
 124  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0))
 125         owner:          THIS_MODULE,
 126  #endif
 127         read:           can_read,
 128         write:          can_write,
 129         poll:           can_poll,
 130         ioctl:          can_ioctl,
 131         open:           can_open,
 132         release:        can_close,
 133   #ifdef CAN_ENABLE_KERN_FASYNC
 134         fasync:         can_fasync
 135   #endif /*CAN_ENABLE_KERN_FASYNC*/
 136 };
 137
 138 EXPORT_SYMBOL(can_fops);
 139
 140
 141 #ifdef CAN_WITH_RTL
 142 struct rtl_file_operations can_fops_rtl = {
 143         llseek:         NULL,
 144         read:           can_read_rtl_posix,
 145         write:          can_write_rtl_posix,
 146         ioctl:          can_ioctl_rtl_posix,
 147         mmap:           NULL,
 148         open:           can_open_rtl_posix,
 149         release:        can_release_rtl_posix
 150 };
 151 #endif /*CAN_WITH_RTL*/
 152
 153
 154 int init_module(void)
 155 {
 156         int res=0,i=0, j;
 157         struct candevice_t *candev;
 158         struct chip_t *chip;
 159
 160         if (parse_mod_parms())
 161                 return -EINVAL;
 162
 163         canqueue_kern_initialize();
 164
 165         if (init_hw_struct())
 166                 return -ENODEV;
 167
 168         #ifdef CAN_DEBUG
 169                 list_hw();
 170         #endif
 171
 172         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 173         if (res<0) {
 174                 CANMSG("Error registering driver.\n");
 175                 return -ENODEV;
 176         }
 177
 178         #ifdef CAN_WITH_RTL
 179         canqueue_rtl_initialize();
 180         res=rtl_register_rtldev(major,DEVICE_NAME,&can_fops_rtl);
 181         if (res<0) {
 182                 CANMSG("Error registering RT-Linux major number.\n");
 183                 goto rtldev_error;
 184         }
 185         #endif /*CAN_WITH_RTL*/
 186
 187         for (i=0; i<hardware_p->nr_boards; i++) {
 188                 candev=hardware_p->candevice[i];
 189                 if (candev->hwspecops->request_io(candev))
 190                         goto memory_error;
 191                 candev->flags|=CANDEV_IO_RESERVED;
 192         }
 193
 194         for (i=0; i<hardware_p->nr_boards; i++) {
 195                 candev=hardware_p->candevice[i];
 196                 if (candev->hwspecops->reset(candev))
 197                         goto reset_error;
 198         }
 199
 200         can_spin_lock_init(&hardware_p->rtr_lock);
 201         hardware_p->rtr_queue=NULL;
 202
 203         for (i=0; i<hardware_p->nr_boards; i++) {
 204                 candev=hardware_p->candevice[i];
 205                 for(j=0; j<candev->nr_all_chips; j++) {
 206                         if((chip=candev->chip[j])==NULL)
 207                                 continue;
 208                         if(can_chip_setup_irq(chip)<0) {
 209                                 CANMSG("IRQ setup failed\n");
 210                                 goto interrupt_error;
 211                         }
 212                 }
 213
 214                 if (candev->flags & CANDEV_PROGRAMMABLE_IRQ)
 215                         if (candev->hwspecops->program_irq(candev))
 216                                 goto interrupt_error;
 217         }
 218
 219 #ifdef CONFIG_PROC_FS
 220         if (can_init_procdir())
 221                 goto proc_error;
 222 #endif
 223
 224 #ifdef CONFIG_DEVFS_FS
 225         {
 226                 char dev_name[32];
 227                 int dev_minor;
 228                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 229                         if(!objects_p[i]) continue;
 230                         dev_minor=objects_p[i]->minor;
 231                     #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 232                         sprintf (dev_name, "can%d", dev_minor);
 233                         devfs_handles[i]=devfs_register(NULL, dev_name,
 234                                 DEVFS_FL_DEFAULT, major, dev_minor,
 235                                 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 236                                 &can_fops, (void*)objects_p[i]);
 237                     #else
 238                         devfs_mk_cdev(MKDEV(major, dev_minor), S_IFCHR | S_IRUGO | S_IWUGO, "can%d", dev_minor);
 239                     #endif
 240                 }
 241         }
 242 #endif
 243         return 0;
 244
 245 #ifdef CONFIG_PROC_FS
 246         proc_error: ;
 247                 CANMSG("Error registering /proc entry.\n");
 248                 goto memory_error;
 249 #endif
 250
 251         interrupt_error: ;
 252                 CANMSG("Error registering interrupt line.\n");
 253                 goto memory_error;
 254
 255         reset_error: ;
 256                 goto memory_error;
 257
 258         memory_error: ;
 259                 canhardware_done(hardware_p);
 260
 261                 #ifdef CAN_WITH_RTL
 262                 rtl_unregister_rtldev(major,DEVICE_NAME);
 263         rtldev_error:
 264                 canqueue_rtl_done();
 265                 #endif /*CAN_WITH_RTL*/
 266
 267                 res=unregister_chrdev(major,DEVICE_NAME);
 268                 if (res<0)
 269                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 270                 else
 271                         CANMSG("No CAN devices or driver setup error.\n");
 272                 return -ENODEV;
 273
 274 }
 275
 276 void cleanup_module(void)
 277 {
 278         int res=0,i=0;
 279
 280 #ifdef CONFIG_PROC_FS
 281         if (can_delete_procdir())
 282                 CANMSG("Error unregistering /proc/can entry.\n");
 283 #endif
 284
 285 #ifdef CONFIG_DEVFS_FS
 286         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 287             #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 288                 if(devfs_handles[i])
 289                         devfs_unregister(devfs_handles[i]);
 290             #else
 291                 int dev_minor;
 292                 if(!objects_p[i]) continue;
 293                 dev_minor=objects_p[i]->minor;
 294                 if(minor>=0)
 295                         devfs_remove("can%d", dev_minor);
 296             #endif
 297         }
 298 #endif
 299
 300         canhardware_done(hardware_p);
 301
 302         #ifdef CAN_WITH_RTL
 303         rtl_unregister_rtldev(major,DEVICE_NAME);
 304         canqueue_rtl_done();
 305         #endif /*CAN_WITH_RTL*/
 306
 307         if ( can_del_mem_list() )
 308                 CANMSG("Error deallocating memory\n");
 309
 310         res=unregister_chrdev(major,DEVICE_NAME);
 311         if (res<0)
 312                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 313 }