lincan/src/main.c

   1 /* main.c
   2  * Linux CAN-bus device driver.
   3  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
   4  * This software is released under the GPL-License.
   5  * Version 0.7  6 Aug 2001
   6  */
   7
   8 #define EXPORT_SYMTAB
   9
  10 #include <linux/autoconf.h>
  11 #if defined (CONFIG_MODVERSIONS) && !defined (MODVERSIONS)
  12 #define MODVERSIONS
  13 #endif
  14
  15 #include <linux/module.h>
  16
  17 #if defined (MODVERSIONS)
  18 #include <linux/modversions.h>
  19 #endif
  20
  21 #include <linux/kernel.h>
  22 #include <linux/fs.h>
  23 #include <linux/wrapper.h>
  24 #include <linux/sched.h>
  25 #include <linux/poll.h>
  26 #include <linux/version.h>
  27 #include <linux/autoconf.h>
  28 #include <linux/interrupt.h>
  29
  30 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
  31 #include <asm/spinlock.h>
  32 #else
  33 #include <linux/spinlock.h>
  34 #endif
  35
  36 #if !defined (__GENKSYMS__)
  37 #if (defined (MODVERSIONS) && !defined(NOVER))
  38 #include <linux/modversions.h>
  39 /*#include "../include/main.ver"*/
  40 #endif
  41 #endif
  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/setup.h"
  50 #include "../include/proc.h"
  51 #include "../include/open.h"
  52 #include "../include/close.h"
  53 #include "../include/read.h"
  54 #include "../include/select.h"
  55 #include "../include/irq.h"
  56 #include "../include/ioctl.h"
  57 #include "../include/write.h"
  58
  59 #define EXPORT_SYMTAB
  60
  61 /* Module parameters, some must be supplied at module loading time */
  62 int major=CAN_MAJOR;
  63 MODULE_PARM(major,"1i");
  64 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};
  65 /*MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");*/
  66 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  67 int extended=0;
  68 MODULE_PARM(extended,"1i");
  69 int pelican=0;
  70 MODULE_PARM(pelican,"1i");
  71 int baudrate=0;
  72 MODULE_PARM(baudrate,"1i");
  73 char *hw[MAX_HW_CARDS]={NULL,};
  74 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  75 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};
  76 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  77 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  78 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  79 int stdmask=0;
  80 MODULE_PARM(stdmask, "1i");
  81 int extmask=0;
  82 MODULE_PARM(extmask, "1i");
  83 int mo15mask=0;
  84 MODULE_PARM(mo15mask, "1i");
  85
  86 /* Other module attributes */
  87 #ifdef MODULE_SUPPORTED_DEVICE
  88 MODULE_SUPPORTED_DEVICE("can");
  89 #endif
  90 #ifdef MODULE_LICENSE
  91 MODULE_LICENSE("GPL");
  92 #endif
  93 #ifdef MODULE_DESCRIPTION
  94 MODULE_DESCRIPTION("Universal Linux CAN-bus device driver");
  95 #endif
  96
  97 /* Global structures, used to describe the installed hardware. */
  98 struct canhardware_t canhardware;
  99 struct canhardware_t *hardware_p=&canhardware;
 100 struct candevice_t *candevices_p[MAX_HW_CARDS];
 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
 146         if (parse_mod_parms())
 147                 return -EINVAL;
 148
 149         if (init_hw_struct())
 150                 return -ENODEV;
 151
 152         #ifdef CAN_DEBUG
 153                 list_hw();
 154         #endif
 155
 156         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 157         if (res<0) {
 158                 CANMSG("Error registering driver.\n");
 159                 return -ENODEV;
 160         }
 161
 162         for (i=0; i<hardware_p->nr_boards; i++) {
 163                 if (candevices_p[i]->hwspecops->request_io(candevices_p[i]->io_addr))
 164                 goto memory_error;
 165         }
 166
 167         for (i=0; i<hardware_p->nr_boards; i++) {
 168                 if (candevices_p[i]->hwspecops->reset(i))
 169                         goto reset_error;
 170         }
 171
 172         spin_lock_init(&hardware_p->rtr_lock);
 173         hardware_p->rtr_queue=NULL;
 174
 175         i=0;
 176         while ( (chips_p[i] != NULL) && (i < MAX_TOT_CHIPS) ) {
 177                 if (!strcmp(chips_p[i]->chip_type,"i82527")) {
 178                         if (request_irq(chips_p[i]->chip_irq,i82527_irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 179                                 goto interrupt_error;
 180                         else
 181                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 182                 }
 183                 if (!strcmp(chips_p[i]->chip_type,"sja1000p") ||
 184                                 !strcmp(chips_p[i]->chip_type,"sja1000")) {
 185                         if (request_irq(chips_p[i]->chip_irq,
 186         chips_p[i]->chipspecops->irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 187                                 goto interrupt_error;
 188                         else
 189                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 190                 }
 191                 i++;
 192         }
 193
 194         for (i=0; i<hardware_p->nr_boards; i++) {
 195                 if (candevices_p[i]->flags & PROGRAMMABLE_IRQ)
 196                         if (candevices_p[i]->hwspecops->program_irq(i))
 197                                 goto interrupt_error;
 198         }
 199
 200 #ifdef CONFIG_PROC_FS
 201         if (can_init_procdir())
 202                 goto proc_error;
 203 #endif
 204
 205 #ifdef CONFIG_DEVFS_FS
 206         {
 207                 char dev_name[32];
 208                 int dev_minor;
 209                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 210                         if(!objects_p[i]) continue;
 211                         dev_minor=objects_p[i]->minor;
 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                 }
 218         }
 219 #endif
 220         return 0;
 221
 222 #ifdef CONFIG_PROC_FS
 223         proc_error: ;
 224                 CANMSG("Error registering /proc entry.\n");
 225                 goto memory_error;
 226 #endif
 227
 228         interrupt_error: ;
 229                 CANMSG("Error registering interrupt line.\n");
 230                 goto memory_error;
 231
 232         reset_error: ;
 233                 goto memory_error;
 234
 235         memory_error: ;
 236                 for (i=0; i<hardware_p->nr_boards; i++)
 237                         candevices_p[i]->hwspecops->release_io(candevices_p[i]->io_addr);
 238                 goto register_error;
 239
 240         register_error: ;
 241                 res=unregister_chrdev(major,DEVICE_NAME);
 242                 if (res<0)
 243                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 244                 else
 245                         CANMSG("Successfully unloaded CAN driver.\n");
 246                 return -ENODEV;
 247
 248 }
 249
 250 void cleanup_module(void)
 251 {
 252         int res=0,i=0;
 253
 254 #ifdef CONFIG_PROC_FS
 255         if (can_delete_procdir())
 256                 CANMSG("Error unregistering /proc/can entry.\n");
 257 #endif
 258
 259 #ifdef CONFIG_DEVFS_FS
 260         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 261                 if(devfs_handles[i])
 262                         devfs_unregister(devfs_handles[i]);
 263         }
 264 #endif
 265         i=0;
 266         while ( (chips_p[i] != NULL) & (i < MAX_TOT_CHIPS) ) {
 267                 free_irq(chips_p[i]->chip_irq, chips_p[i]);
 268                 i++;
 269         }
 270
 271         for (i=0; i<hardware_p->nr_boards; i++)
 272                 candevices_p[i]->hwspecops->release_io(candevices_p[i]->io_addr);
 273
 274         if ( del_mem_list() )
 275                 CANMSG("Error deallocating memory\n");
 276
 277         res=unregister_chrdev(major,DEVICE_NAME);
 278         if (res<0)
 279                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 280 }