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 (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
  29 #include <asm/spinlock.h>
  30 #else
  31 #include <linux/spinlock.h>
  32 #endif
  33
  34 #if !defined (__GENKSYMS__)
  35 #if (defined (MODVERSIONS) && !defined(NOVER))
  36 #include <linux/modversions.h>
  37 /*#include "../include/main.ver"*/
  38 #endif
  39 #endif
  40
  41 /*#undef CONFIG_DEVFS_FS*/
  42
  43 #ifdef CONFIG_DEVFS_FS
  44 #include <linux/miscdevice.h>
  45 #endif
  46
  47 #include "../include/main.h"
  48 #include "../include/modparms.h"
  49 #include "../include/devcommon.h"
  50 #include "../include/setup.h"
  51 #include "../include/proc.h"
  52 #include "../include/open.h"
  53 #include "../include/close.h"
  54 #include "../include/read.h"
  55 #include "../include/select.h"
  56 #include "../include/irq.h"
  57 #include "../include/ioctl.h"
  58 #include "../include/write.h"
  59
  60 #define EXPORT_SYMTAB
  61
  62 /* Module parameters, some must be supplied at module loading time */
  63 int major=CAN_MAJOR;
  64 MODULE_PARM(major,"1i");
  65 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};
  66 /*MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");*/
  67 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  68 int extended=0;
  69 MODULE_PARM(extended,"1i");
  70 int pelican=0;
  71 MODULE_PARM(pelican,"1i");
  72 int baudrate=0;
  73 MODULE_PARM(baudrate,"1i");
  74 char *hw[MAX_HW_CARDS]={NULL,};
  75 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  76 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};
  77 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  78 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  79 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  80 int stdmask=0;
  81 MODULE_PARM(stdmask, "1i");
  82 int extmask=0;
  83 MODULE_PARM(extmask, "1i");
  84 int mo15mask=0;
  85 MODULE_PARM(mo15mask, "1i");
  86
  87 /* Other module attributes */
  88 #ifdef MODULE_SUPPORTED_DEVICE
  89 MODULE_SUPPORTED_DEVICE("can");
  90 #endif
  91 #ifdef MODULE_LICENSE
  92 MODULE_LICENSE("GPL");
  93 #endif
  94 #ifdef MODULE_DESCRIPTION
  95 MODULE_DESCRIPTION("Universal Linux CAN-bus device driver");
  96 #endif
  97
  98 /* Global structures, used to describe the installed hardware. */
  99 struct canhardware_t canhardware;
 100 struct canhardware_t *hardware_p=&canhardware;
 101 struct chip_t *chips_p[MAX_TOT_CHIPS];
 102 struct msgobj_t *objects_p[MAX_TOT_MSGOBJS];
 103 #ifdef CONFIG_DEVFS_FS
 104 devfs_handle_t  devfs_handles[MAX_TOT_MSGOBJS];
 105 #endif
 106
 107 /* Pointers to dynamically allocated memory are maintained in a linked list
 108  * to ease memory deallocation.
 109  */
 110 struct mem_addr *mem_head=NULL;
 111
 112 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
 113 struct file_operations can_fops=
 114 {
 115         NULL,                           /* llseek */
 116         read:           can_read,
 117         write:          can_write,
 118         NULL,                           /* readdir */
 119         poll:           can_poll,
 120         ioctl:          can_ioctl,
 121         NULL,                           /* mmap */
 122         open:           can_open,
 123         NULL,                           /* flush */
 124         release:        can_close,
 125         NULL,                           /* fsync */
 126 };
 127 #else
 128 struct file_operations can_fops=
 129 {
 130         owner:          THIS_MODULE,
 131         read:           can_read,
 132         write:          can_write,
 133         poll:           can_poll,
 134         ioctl:          can_ioctl,
 135         open:           can_open,
 136         release:        can_close,
 137 };
 138 #endif
 139
 140 EXPORT_SYMBOL(can_fops);
 141
 142 int init_module(void)
 143 {
 144         int res=0,i=0;
 145         struct candevice_t *candev;
 146
 147         if (parse_mod_parms())
 148                 return -EINVAL;
 149
 150         if (init_hw_struct())
 151                 return -ENODEV;
 152
 153         #ifdef CAN_DEBUG
 154                 list_hw();
 155         #endif
 156
 157         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 158         if (res<0) {
 159                 CANMSG("Error registering driver.\n");
 160                 return -ENODEV;
 161         }
 162
 163         for (i=0; i<hardware_p->nr_boards; i++) {
 164                 candev=hardware_p->candevice[i];
 165                 if (candev->hwspecops->request_io(candev))
 166                         goto memory_error;
 167         }
 168
 169         for (i=0; i<hardware_p->nr_boards; i++) {
 170                 candev=hardware_p->candevice[i];
 171                 if (candev->hwspecops->reset(candev))
 172                         goto reset_error;
 173         }
 174
 175         spin_lock_init(&hardware_p->rtr_lock);
 176         hardware_p->rtr_queue=NULL;
 177
 178         i=0;
 179         while ( (chips_p[i] != NULL) && (i < MAX_TOT_CHIPS) ) {
 180                 if (chips_p[i]->chipspecops->irq_handler) {
 181                         if (request_irq(chips_p[i]->chip_irq,chips_p[i]->chipspecops->irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 182                                 goto interrupt_error;
 183                         else
 184                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 185                 }
 186                 i++;
 187         }
 188
 189         for (i=0; i<hardware_p->nr_boards; i++) {
 190                 candev=hardware_p->candevice[i];
 191                 if (candev->flags & PROGRAMMABLE_IRQ)
 192                         if (candev->hwspecops->program_irq(candev))
 193                                 goto interrupt_error;
 194         }
 195
 196 #ifdef CONFIG_PROC_FS
 197         if (can_init_procdir())
 198                 goto proc_error;
 199 #endif
 200
 201 #ifdef CONFIG_DEVFS_FS
 202         {
 203                 char dev_name[32];
 204                 int dev_minor;
 205                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 206                         if(!objects_p[i]) continue;
 207                         dev_minor=objects_p[i]->minor;
 208                         sprintf (dev_name, "can%d", dev_minor);
 209                         devfs_handles[i]=devfs_register(NULL, dev_name,
 210                                 DEVFS_FL_DEFAULT, major, dev_minor,
 211                                 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 212                                 &can_fops, (void*)objects_p[i]);
 213                 }
 214         }
 215 #endif
 216         return 0;
 217
 218 #ifdef CONFIG_PROC_FS
 219         proc_error: ;
 220                 CANMSG("Error registering /proc entry.\n");
 221                 goto memory_error;
 222 #endif
 223
 224         interrupt_error: ;
 225                 CANMSG("Error registering interrupt line.\n");
 226                 goto memory_error;
 227
 228         reset_error: ;
 229                 goto memory_error;
 230
 231         memory_error: ;
 232                 for (i=0; i<hardware_p->nr_boards; i++) {
 233                         candev=hardware_p->candevice[i];
 234                         candev->hwspecops->release_io(candev);
 235                 }
 236                 goto register_error;
 237
 238         register_error: ;
 239                 res=unregister_chrdev(major,DEVICE_NAME);
 240                 if (res<0)
 241                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 242                 else
 243                         CANMSG("Successfully unloaded CAN driver.\n");
 244                 return -ENODEV;
 245
 246 }
 247
 248 void cleanup_module(void)
 249 {
 250         int res=0,i=0;
 251         struct candevice_t *candev;
 252
 253 #ifdef CONFIG_PROC_FS
 254         if (can_delete_procdir())
 255                 CANMSG("Error unregistering /proc/can entry.\n");
 256 #endif
 257
 258 #ifdef CONFIG_DEVFS_FS
 259         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 260                 if(devfs_handles[i])
 261                         devfs_unregister(devfs_handles[i]);
 262         }
 263 #endif
 264         i=0;
 265         while ( (chips_p[i] != NULL) & (i < MAX_TOT_CHIPS) ) {
 266                 free_irq(chips_p[i]->chip_irq, chips_p[i]);
 267                 i++;
 268         }
 269
 270         for (i=0; i<hardware_p->nr_boards; i++){
 271                 candev=hardware_p->candevice[i];
 272                 candev->hwspecops->release_io(candev);
 273         }
 274
 275         if ( del_mem_list() )
 276                 CANMSG("Error deallocating memory\n");
 277
 278         res=unregister_chrdev(major,DEVICE_NAME);
 279         if (res<0)
 280                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 281 }