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 #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[MAX_TOT_CHIPS];
  72 MODULE_PARM(baudrate, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  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 int processlocal=0;
  86 MODULE_PARM(processlocal, "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 struct file_operations can_fops=
 116 {
 117  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0))
 118         owner:          THIS_MODULE,
 119  #endif
 120         read:           can_read,
 121         write:          can_write,
 122         poll:           can_poll,
 123         ioctl:          can_ioctl,
 124         open:           can_open,
 125         release:        can_close,
 126   #ifdef CAN_ENABLE_KERN_FASYNC
 127         fasync:         can_fasync
 128   #endif /*CAN_ENABLE_KERN_FASYNC*/
 129 };
 130
 131 EXPORT_SYMBOL(can_fops);
 132
 133 int init_module(void)
 134 {
 135         int res=0,i=0, j;
 136         struct candevice_t *candev;
 137         struct chip_t *chip;
 138
 139         if (parse_mod_parms())
 140                 return -EINVAL;
 141
 142         canqueue_kern_initialize();
 143
 144         if (init_hw_struct())
 145                 return -ENODEV;
 146
 147         #ifdef CAN_DEBUG
 148                 list_hw();
 149         #endif
 150
 151         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 152         if (res<0) {
 153                 CANMSG("Error registering driver.\n");
 154                 return -ENODEV;
 155         }
 156
 157         #ifdef CAN_WITH_RTL
 158         canqueue_rtl_initialize();
 159         #endif /*CAN_WITH_RTL*/
 160
 161         for (i=0; i<hardware_p->nr_boards; i++) {
 162                 candev=hardware_p->candevice[i];
 163                 if (candev->hwspecops->request_io(candev))
 164                         goto memory_error;
 165                 candev->flags|=CANDEV_IO_RESERVED;
 166         }
 167
 168         for (i=0; i<hardware_p->nr_boards; i++) {
 169                 candev=hardware_p->candevice[i];
 170                 if (candev->hwspecops->reset(candev))
 171                         goto reset_error;
 172         }
 173
 174         can_spin_lock_init(&hardware_p->rtr_lock);
 175         hardware_p->rtr_queue=NULL;
 176
 177         for (i=0; i<hardware_p->nr_boards; i++) {
 178                 candev=hardware_p->candevice[i];
 179                 for(j=0; j<candev->nr_all_chips; j++) {
 180                         if((chip=candev->chip[j])==NULL)
 181                                 continue;
 182                         if(can_chip_setup_irq(chip)<0) {
 183                                 CANMSG("IRQ setup failed\n");
 184                                 goto interrupt_error;
 185                         }
 186                 }
 187
 188                 if (candev->flags & CANDEV_PROGRAMMABLE_IRQ)
 189                         if (candev->hwspecops->program_irq(candev))
 190                                 goto interrupt_error;
 191         }
 192
 193 #ifdef CONFIG_PROC_FS
 194         if (can_init_procdir())
 195                 goto proc_error;
 196 #endif
 197
 198 #ifdef CONFIG_DEVFS_FS
 199         {
 200                 char dev_name[32];
 201                 int dev_minor;
 202                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 203                         if(!objects_p[i]) continue;
 204                         dev_minor=objects_p[i]->minor;
 205                     #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 206                         sprintf (dev_name, "can%d", dev_minor);
 207                         devfs_handles[i]=devfs_register(NULL, dev_name,
 208                                 DEVFS_FL_DEFAULT, major, dev_minor,
 209                                 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 210                                 &can_fops, (void*)objects_p[i]);
 211                     #else
 212                         devfs_mk_cdev(MKDEV(major, dev_minor), S_IFCHR | S_IRUGO | S_IWUGO, "can%d", dev_minor);
 213                     #endif
 214                 }
 215         }
 216 #endif
 217         return 0;
 218
 219 #ifdef CONFIG_PROC_FS
 220         proc_error: ;
 221                 CANMSG("Error registering /proc entry.\n");
 222                 goto memory_error;
 223 #endif
 224
 225         interrupt_error: ;
 226                 CANMSG("Error registering interrupt line.\n");
 227                 goto memory_error;
 228
 229         reset_error: ;
 230                 goto memory_error;
 231
 232         memory_error: ;
 233                 canhardware_done(hardware_p);
 234
 235                 #ifdef CAN_WITH_RTL
 236                 canqueue_rtl_done();
 237                 #endif /*CAN_WITH_RTL*/
 238
 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("No CAN devices or driver setup error.\n");
 244                 return -ENODEV;
 245
 246 }
 247
 248 void cleanup_module(void)
 249 {
 250         int res=0,i=0;
 251
 252 #ifdef CONFIG_PROC_FS
 253         if (can_delete_procdir())
 254                 CANMSG("Error unregistering /proc/can entry.\n");
 255 #endif
 256
 257 #ifdef CONFIG_DEVFS_FS
 258         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 259             #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 260                 if(devfs_handles[i])
 261                         devfs_unregister(devfs_handles[i]);
 262             #else
 263                 int dev_minor;
 264                 if(!objects_p[i]) continue;
 265                 dev_minor=objects_p[i]->minor;
 266                 if(minor>=0)
 267                         devfs_remove("can%d", dev_minor);
 268             #endif
 269         }
 270 #endif
 271
 272         canhardware_done(hardware_p);
 273
 274         #ifdef CAN_WITH_RTL
 275         canqueue_rtl_done();
 276         #endif /*CAN_WITH_RTL*/
 277
 278         if ( can_del_mem_list() )
 279                 CANMSG("Error deallocating memory\n");
 280
 281         res=unregister_chrdev(major,DEVICE_NAME);
 282         if (res<0)
 283                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 284 }