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/devfs_fs_kernel.h>
  45 #include <linux/miscdevice.h>
  46 #endif
  47
  48 #include "../include/main.h"
  49 #include "../include/modparms.h"
  50 #include "../include/devcommon.h"
  51 #include "../include/setup.h"
  52 #include "../include/proc.h"
  53 #include "../include/open.h"
  54 #include "../include/close.h"
  55 #include "../include/read.h"
  56 #include "../include/select.h"
  57 #include "../include/irq.h"
  58 #include "../include/ioctl.h"
  59 #include "../include/write.h"
  60
  61 #define EXPORT_SYMTAB
  62
  63 /* Module parameters, some must be supplied at module loading time */
  64 int major=CAN_MAJOR;
  65 MODULE_PARM(major,"1i");
  66 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};
  67 /*MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");*/
  68 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  69 int extended=0;
  70 MODULE_PARM(extended,"1i");
  71 int pelican=0;
  72 MODULE_PARM(pelican,"1i");
  73 int baudrate=0;
  74 MODULE_PARM(baudrate,"1i");
  75 char *hw[MAX_HW_CARDS]={NULL,};
  76 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  77 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};
  78 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  79 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  80 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  81 int stdmask=0;
  82 MODULE_PARM(stdmask, "1i");
  83 int extmask=0;
  84 MODULE_PARM(extmask, "1i");
  85 int mo15mask=0;
  86 MODULE_PARM(mo15mask, "1i");
  87
  88 /* Other module attributes */
  89 #ifdef MODULE_SUPPORTED_DEVICE
  90 MODULE_SUPPORTED_DEVICE("can");
  91 #endif
  92 #ifdef MODULE_LICENSE
  93 MODULE_LICENSE("GPL");
  94 #endif
  95 #ifdef MODULE_DESCRIPTION
  96 MODULE_DESCRIPTION("Universal Linux CAN-bus device driver");
  97 #endif
  98
  99 /* Global structures, used to describe the installed hardware. */
 100 struct canhardware_t canhardware;
 101 struct canhardware_t *hardware_p=&canhardware;
 102 struct chip_t *chips_p[MAX_TOT_CHIPS];
 103 struct msgobj_t *objects_p[MAX_TOT_MSGOBJS];
 104 #ifdef CONFIG_DEVFS_FS
 105 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,60))
 106 devfs_handle_t  devfs_handles[MAX_TOT_MSGOBJS];
 107 #endif
 108 #endif
 109
 110 /* Pointers to dynamically allocated memory are maintained in a linked list
 111  * to ease memory deallocation.
 112  */
 113 struct mem_addr *mem_head=NULL;
 114
 115 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
 116 struct file_operations can_fops=
 117 {
 118         NULL,                           /* llseek */
 119         read:           can_read,
 120         write:          can_write,
 121         NULL,                           /* readdir */
 122         poll:           can_poll,
 123         ioctl:          can_ioctl,
 124         NULL,                           /* mmap */
 125         open:           can_open,
 126         NULL,                           /* flush */
 127         release:        can_close,
 128         NULL,                           /* fsync */
 129 };
 130 #else
 131 struct file_operations can_fops=
 132 {
 133         owner:          THIS_MODULE,
 134         read:           can_read,
 135         write:          can_write,
 136         poll:           can_poll,
 137         ioctl:          can_ioctl,
 138         open:           can_open,
 139         release:        can_close,
 140 };
 141 #endif
 142
 143 EXPORT_SYMBOL(can_fops);
 144
 145 int init_module(void)
 146 {
 147         int res=0,i=0;
 148         struct candevice_t *candev;
 149
 150         if (parse_mod_parms())
 151                 return -EINVAL;
 152
 153         if (init_hw_struct())
 154                 return -ENODEV;
 155
 156         #ifdef CAN_DEBUG
 157                 list_hw();
 158         #endif
 159
 160         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 161         if (res<0) {
 162                 CANMSG("Error registering driver.\n");
 163                 return -ENODEV;
 164         }
 165
 166         for (i=0; i<hardware_p->nr_boards; i++) {
 167                 candev=hardware_p->candevice[i];
 168                 if (candev->hwspecops->request_io(candev))
 169                         goto memory_error;
 170         }
 171
 172         for (i=0; i<hardware_p->nr_boards; i++) {
 173                 candev=hardware_p->candevice[i];
 174                 if (candev->hwspecops->reset(candev))
 175                         goto reset_error;
 176         }
 177
 178         spin_lock_init(&hardware_p->rtr_lock);
 179         hardware_p->rtr_queue=NULL;
 180
 181         i=0;
 182         while ( (chips_p[i] != NULL) && (i < MAX_TOT_CHIPS) ) {
 183                 if (chips_p[i]->chipspecops->irq_handler) {
 184                         if (request_irq(chips_p[i]->chip_irq,chips_p[i]->chipspecops->irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 185                                 goto interrupt_error;
 186                         else
 187                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 188                 }
 189                 i++;
 190         }
 191
 192         for (i=0; i<hardware_p->nr_boards; i++) {
 193                 candev=hardware_p->candevice[i];
 194                 if (candev->flags & PROGRAMMABLE_IRQ)
 195                         if (candev->hwspecops->program_irq(candev))
 196                                 goto interrupt_error;
 197         }
 198
 199 #ifdef CONFIG_PROC_FS
 200         if (can_init_procdir())
 201                 goto proc_error;
 202 #endif
 203
 204 #ifdef CONFIG_DEVFS_FS
 205         {
 206                 char dev_name[32];
 207                 int dev_minor;
 208                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 209                         if(!objects_p[i]) continue;
 210                         dev_minor=objects_p[i]->minor;
 211                     #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 212                         sprintf (dev_name, "can%d", dev_minor);
 213                         devfs_handles[i]=devfs_register(NULL, dev_name,
 214                                 DEVFS_FL_DEFAULT, major, dev_minor,
 215                                 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 216                                 &can_fops, (void*)objects_p[i]);
 217                     #else
 218                         devfs_mk_cdev(MKDEV(major, dev_minor), S_IFCHR | S_IRUGO | S_IWUGO, "can%d", dev_minor);
 219                     #endif
 220                 }
 221         }
 222 #endif
 223         return 0;
 224
 225 #ifdef CONFIG_PROC_FS
 226         proc_error: ;
 227                 CANMSG("Error registering /proc entry.\n");
 228                 goto memory_error;
 229 #endif
 230
 231         interrupt_error: ;
 232                 CANMSG("Error registering interrupt line.\n");
 233                 goto memory_error;
 234
 235         reset_error: ;
 236                 goto memory_error;
 237
 238         memory_error: ;
 239                 for (i=0; i<hardware_p->nr_boards; i++) {
 240                         candev=hardware_p->candevice[i];
 241                         candev->hwspecops->release_io(candev);
 242                 }
 243                 goto register_error;
 244
 245         register_error: ;
 246                 res=unregister_chrdev(major,DEVICE_NAME);
 247                 if (res<0)
 248                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 249                 else
 250                         CANMSG("Successfully unloaded CAN driver.\n");
 251                 return -ENODEV;
 252
 253 }
 254
 255 void cleanup_module(void)
 256 {
 257         int res=0,i=0;
 258         struct candevice_t *candev;
 259
 260 #ifdef CONFIG_PROC_FS
 261         if (can_delete_procdir())
 262                 CANMSG("Error unregistering /proc/can entry.\n");
 263 #endif
 264
 265 #ifdef CONFIG_DEVFS_FS
 266         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 267             #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 268                 if(devfs_handles[i])
 269                         devfs_unregister(devfs_handles[i]);
 270             #else
 271                 int dev_minor;
 272                 if(!objects_p[i]) continue;
 273                 dev_minor=objects_p[i]->minor;
 274                 if(minor>=0)
 275                         devfs_remove("can%d", dev_minor);
 276             #endif
 277         }
 278 #endif
 279         i=0;
 280         while ( (chips_p[i] != NULL) & (i < MAX_TOT_CHIPS) ) {
 281                 if(chips_p[i]->chipspecops->irq_handler)
 282                         free_irq(chips_p[i]->chip_irq, chips_p[i]);
 283                 i++;
 284         }
 285
 286         for (i=0; i<hardware_p->nr_boards; i++){
 287                 candev=hardware_p->candevice[i];
 288                 candev->hwspecops->release_io(candev);
 289         }
 290
 291         if ( del_mem_list() )
 292                 CANMSG("Error deallocating memory\n");
 293
 294         res=unregister_chrdev(major,DEVICE_NAME);
 295         if (res<0)
 296                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 297 }