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/version.h>
  26 #include <linux/autoconf.h>
  27
  28 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,2,19))
  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 #include "../include/main.h"
  42 #include "../include/modparms.h"
  43 #include "../include/setup.h"
  44 #include "../include/proc.h"
  45 #include "../include/open.h"
  46 #include "../include/close.h"
  47 #include "../include/read.h"
  48 #include "../include/irq.h"
  49 #include "../include/ioctl.h"
  50 #include "../include/write.h"
  51
  52 #define EXPORT_SYMTAB
  53
  54 /* Module parameters, some must be supplied at module loading time */
  55 int major=CAN_MAJOR;
  56 MODULE_PARM(major,"1i");
  57 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};
  58 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");
  59 int extended=0;
  60 MODULE_PARM(extended,"1i");
  61 int pelican=0;
  62 MODULE_PARM(pelican,"1i");
  63 int baudrate=0;
  64 MODULE_PARM(baudrate,"1i");
  65 char *hw[MAX_HW_CARDS]={NULL,};
  66 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  67 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};
  68 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  69 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  70 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  71 int stdmask=0;
  72 MODULE_PARM(stdmask, "1i");
  73 int extmask=0;
  74 MODULE_PARM(extmask, "1i");
  75 int mo15mask=0;
  76 MODULE_PARM(mo15mask, "1i");
  77
  78 /* Global structures, used to describe the installed hardware. */
  79 struct canhardware_t canhardware;
  80 struct canhardware_t *hardware_p=&canhardware;
  81 struct candevice_t *candevices_p[MAX_HW_CARDS];
  82 struct chip_t *chips_p[MAX_TOT_CHIPS];
  83 struct msgobj_t *objects_p[MAX_TOT_MSGOBJS];
  84
  85 /* Pointers to dynamically allocated memory are maintained in a linked list
  86  * to ease memory deallocation.
  87  */
  88 struct mem_addr *mem_head=NULL;
  89
  90 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,2,19))
  91 struct file_operations can_fops=
  92 {
  93         NULL,                           /* llseek */
  94         read:           can_read,
  95         write:          can_write,
  96         NULL,                           /* readdir */
  97         NULL,                           /* poll */
  98         ioctl:          can_ioctl,
  99         NULL,                           /* mmap */
 100         open:           can_open,
 101         NULL,                           /* flush */
 102         release:        can_close,
 103         NULL,                           /* fsync */
 104 };
 105 #else
 106 struct file_operations can_fops=
 107 {
 108         owner:          THIS_MODULE,
 109         read:           can_read,
 110         write:          can_write,
 111         ioctl:          can_ioctl,
 112         open:           can_open,
 113         release:        can_close,
 114 };
 115 #endif
 116
 117 EXPORT_SYMBOL(can_fops);
 118
 119 int init_module(void)
 120 {
 121         int res=0,i=0;
 122
 123         if (parse_mod_parms())
 124                 return -EINVAL;
 125
 126         if (init_hw_struct())
 127                 return -ENODEV;
 128
 129         #ifdef CAN_DEBUG
 130                 list_hw();
 131         #endif
 132
 133         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 134         if (res<0) {
 135                 CANMSG("Error registering driver.\n");
 136                 return -ENODEV;
 137         }
 138
 139         for (i=0; i<hardware_p->nr_boards; i++) {
 140                 if (candevices_p[i]->hwspecops->request_io(candevices_p[i]->io_addr))
 141                 goto memory_error;
 142         }
 143
 144         for (i=0; i<hardware_p->nr_boards; i++) {
 145                 if (candevices_p[i]->hwspecops->reset(i))
 146                         goto reset_error;
 147         }
 148
 149         i=0;
 150         while ( (chips_p[i] != NULL) && (i < MAX_TOT_CHIPS) ) {
 151                 if (!strcmp(chips_p[i]->chip_type,"i82527")) {
 152                         if (request_irq(chips_p[i]->chip_irq,i82527_irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 153                                 goto interrupt_error;
 154                         else
 155                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 156                 }
 157                 if (!strcmp(chips_p[i]->chip_type,"sja1000p") ||
 158                                 !strcmp(chips_p[i]->chip_type,"sja1000")) {
 159                         if (request_irq(chips_p[i]->chip_irq,
 160         chips_p[i]->chipspecops->irq_handler,SA_SHIRQ,DEVICE_NAME,chips_p[i]))
 161                                 goto interrupt_error;
 162                         else
 163                                 DEBUGMSG("Registered interrupt %d\n",chips_p[i]->chip_irq);
 164                 }
 165                 i++;
 166         }
 167
 168         for (i=0; i<hardware_p->nr_boards; i++) {
 169                 if (candevices_p[i]->flags & PROGRAMMABLE_IRQ)
 170                         if (candevices_p[i]->hwspecops->program_irq(i))
 171                                 goto interrupt_error;
 172         }
 173
 174         spin_lock_init(&hardware_p->rtr_lock);
 175         hardware_p->rtr_queue=NULL;
 176
 177 #ifdef CONFIG_PROC_FS
 178         if (can_init_procdir())
 179                 goto proc_error;
 180 #endif
 181
 182         return 0;
 183
 184 #ifdef CONFIG_PROC_FS
 185         proc_error: ;
 186                 CANMSG("Error registering /proc entry.\n");
 187                 goto memory_error;
 188 #endif
 189
 190         interrupt_error: ;
 191                 CANMSG("Error registering interrupt line.\n");
 192                 goto memory_error;
 193
 194         reset_error: ;
 195                 goto memory_error;
 196
 197         memory_error: ;
 198                 for (i=0; i<hardware_p->nr_boards; i++)
 199                         candevices_p[i]->hwspecops->release_io(candevices_p[i]->io_addr);
 200                 goto register_error;
 201
 202         register_error: ;
 203                 res=unregister_chrdev(major,DEVICE_NAME);
 204                 if (res<0)
 205                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 206                 else
 207                         CANMSG("Successfully unloaded CAN driver.\n");
 208                 return -ENODEV;
 209
 210 }
 211
 212 void cleanup_module(void)
 213 {
 214         int res=0,i=0;
 215
 216 #ifdef CONFIG_PROC_FS
 217         if (can_delete_procdir())
 218                 CANMSG("Error unregistering /proc/can entry.\n");
 219 #endif
 220
 221         while ( (chips_p[i] != NULL) & (i < MAX_TOT_CHIPS) ) {
 222                 free_irq(chips_p[i]->chip_irq, chips_p[i]);
 223                 i++;
 224         }
 225
 226         for (i=0; i<hardware_p->nr_boards; i++)
 227                 candevices_p[i]->hwspecops->release_io(candevices_p[i]->io_addr);
 228
 229         if ( del_mem_list() )
 230                 CANMSG("Error deallocating memory\n");
 231
 232         res=unregister_chrdev(major,DEVICE_NAME);
 233         if (res<0)
 234                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 235 }