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 #ifndef EXPORT_SYMTAB
  11 #define EXPORT_SYMTAB
  12 #endif
  13
  14 #include <linux/autoconf.h>
  15
  16 #include <linux/module.h>
  17
  18 #include <linux/kernel.h>
  19 #include <linux/fs.h>
  20 #include <linux/sched.h>
  21 #include <linux/poll.h>
  22 #include <linux/version.h>
  23 #include <linux/autoconf.h>
  24 #include <linux/interrupt.h>
  25
  26 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
  27 #include <linux/wrapper.h>
  28 #endif
  29
  30 #if !defined (__GENKSYMS__)
  31 #if (defined (MODVERSIONS) && !defined(NOVER))
  32 #include <linux/modversions.h>
  33 /*#include "../include/main.ver"*/
  34 #endif
  35 #endif
  36
  37 /*#undef CONFIG_DEVFS_FS*/
  38
  39 #ifdef CONFIG_DEVFS_FS
  40 #include <linux/devfs_fs_kernel.h>
  41 #include <linux/miscdevice.h>
  42 #endif
  43
  44 #include "../include/can.h"
  45 #include "../include/can_sysdep.h"
  46 #include "../include/main.h"
  47 #include "../include/modparms.h"
  48 #include "../include/devcommon.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 #include "../include/finish.h"
  59 #include "../include/fasync.h"
  60
  61 #ifdef CAN_WITH_RTL
  62 #include <rtl_posixio.h>
  63 #include "../include/can_iortl.h"
  64 #endif /*CAN_WITH_RTL*/
  65
  66 #define EXPORT_SYMTAB
  67
  68 can_spinlock_t canuser_manipulation_lock;
  69
  70 /* Module parameters, some must be supplied at module loading time */
  71 int major=CAN_MAJOR;
  72 MODULE_PARM(major,"1i");
  73 MODULE_PARM_DESC(major,"can be used to change default major [" __MODULE_STRING(CAN_MAJOR) "]");
  74 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};
  75 /*MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS)"i");*/
  76 MODULE_PARM(minor, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  77 MODULE_PARM_DESC(minor,"can be used to change default starting minor for each channel");
  78 int extended=0;
  79 MODULE_PARM(extended,"1i");
  80 MODULE_PARM_DESC(extended,"enables automatic switching to extended format if ID>2047,"
  81                         " selects extended frames reception for i82527");
  82 int pelican=0;
  83 MODULE_PARM(pelican,"1i");
  84 MODULE_PARM_DESC(pelican,"unused parameter, PeliCAN used by default for sja1000p chips");
  85 int baudrate[MAX_TOT_CHIPS];
  86 MODULE_PARM(baudrate, "1-" __MODULE_STRING(MAX_TOT_CHIPS_STR)"i");
  87 MODULE_PARM_DESC(baudrate,"baudrate for each channel in step of 1kHz");
  88 char *hw[MAX_HW_CARDS]={NULL,};
  89 MODULE_PARM(hw, "1-" __MODULE_STRING(MAX_HW_CARDS)"s");
  90 MODULE_PARM_DESC(hw,"list of boards types to initialize - virtual,pip5,...");
  91 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};
  92 MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_IRQ)"i");
  93 MODULE_PARM_DESC(irq,"list of iterrupt signal numbers, most ISA has one per chip, no value for PCI or virtual");
  94 unsigned long io[MAX_HW_CARDS]={-1,-1,-1,-1,-1,-1,-1,-1};
  95 MODULE_PARM(io, "1-" __MODULE_STRING(MAX_HW_CARDS)"i");
  96 MODULE_PARM_DESC(io,"IO address for each board, use 0 for PCI or virtual");
  97 int stdmask=0;
  98 MODULE_PARM(stdmask, "1i");
  99 MODULE_PARM_DESC(stdmask,"default standard mask for i82527 chips");
 100 int extmask=0;
 101 MODULE_PARM(extmask, "1i");
 102 MODULE_PARM_DESC(extmask,"default extended mask for i82527 chips");
 103 int mo15mask=0;
 104 MODULE_PARM(mo15mask, "1i");
 105 MODULE_PARM_DESC(mo15mask,"mask for communication object 15 of i82527 chips");
 106 int processlocal=0;
 107 MODULE_PARM(processlocal, "1i");
 108 MODULE_PARM_DESC(processlocal,"select postprocessing/loopback of transmitted messages - "
 109                 "0 .. disabled, 1 .. can be enabled by FIFO filter, 2 .. enabled by default");
 110 #ifdef CAN_WITH_RTL
 111 int can_rtl_priority=-1;
 112 MODULE_PARM(can_rtl_priority, "1i");
 113 MODULE_PARM_DESC(can_rtl_priority,"select priority of chip worker thread");
 114 #endif /*CAN_WITH_RTL*/
 115
 116 /* Other module attributes */
 117 #ifdef MODULE_SUPPORTED_DEVICE
 118 MODULE_SUPPORTED_DEVICE("can");
 119 #endif
 120 #ifdef MODULE_LICENSE
 121 MODULE_LICENSE("GPL");
 122 #endif
 123 #ifdef MODULE_DESCRIPTION
 124 MODULE_DESCRIPTION("Universal Linux CAN-bus device driver");
 125 #endif
 126 #ifdef MODULE_AUTHOR
 127 MODULE_AUTHOR("Pavel Pisa <pisa@cmp.felk.cvut.cz>, Arnaud Westenberg");
 128 #endif
 129
 130 /* Global structures, used to describe the installed hardware. */
 131 struct canhardware_t canhardware;
 132 struct canhardware_t *hardware_p=&canhardware;
 133 struct chip_t *chips_p[MAX_TOT_CHIPS];
 134 struct msgobj_t *objects_p[MAX_TOT_MSGOBJS];
 135 #ifdef CONFIG_DEVFS_FS
 136 #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,60))
 137 devfs_handle_t  devfs_handles[MAX_TOT_MSGOBJS];
 138 #endif
 139 #endif
 140
 141 /* Pointers to dynamically allocated memory are maintained in a linked list
 142  * to ease memory deallocation.
 143  */
 144 struct mem_addr *mem_head=NULL;
 145
 146 struct file_operations can_fops=
 147 {
 148  #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,0))
 149         owner:          THIS_MODULE,
 150  #endif
 151         read:           can_read,
 152         write:          can_write,
 153         poll:           can_poll,
 154         ioctl:          can_ioctl,
 155         open:           can_open,
 156         release:        can_close,
 157   #ifdef CAN_ENABLE_KERN_FASYNC
 158         fasync:         can_fasync
 159   #endif /*CAN_ENABLE_KERN_FASYNC*/
 160 };
 161
 162 EXPORT_SYMBOL(can_fops);
 163
 164
 165 #ifdef CAN_WITH_RTL
 166 struct rtl_file_operations can_fops_rtl = {
 167         llseek:         NULL,
 168         read:           can_read_rtl_posix,
 169         write:          can_write_rtl_posix,
 170         ioctl:          can_ioctl_rtl_posix,
 171         mmap:           NULL,
 172         open:           can_open_rtl_posix,
 173         release:        can_release_rtl_posix
 174 };
 175 #endif /*CAN_WITH_RTL*/
 176
 177
 178 int init_module(void)
 179 {
 180         int res=0,i=0, j;
 181         struct candevice_t *candev;
 182         struct chip_t *chip;
 183
 184         if (parse_mod_parms())
 185                 return -EINVAL;
 186
 187         can_spin_lock_init(&canuser_manipulation_lock);
 188         canqueue_kern_initialize();
 189
 190         if (init_hw_struct())
 191                 return -ENODEV;
 192
 193         #ifdef CAN_DEBUG
 194                 list_hw();
 195         #endif
 196
 197         res=register_chrdev(major,DEVICE_NAME, &can_fops);
 198         if (res<0) {
 199                 CANMSG("Error registering driver.\n");
 200                 return -ENODEV;
 201         }
 202
 203         #ifdef CAN_WITH_RTL
 204         can_spin_lock_init(&can_irq_manipulation_lock);
 205         canqueue_rtl_initialize();
 206         res=rtl_register_rtldev(major,DEVICE_NAME,&can_fops_rtl);
 207         if (res<0) {
 208                 CANMSG("Error registering RT-Linux major number.\n");
 209                 goto rtldev_error;
 210         }
 211         #endif /*CAN_WITH_RTL*/
 212
 213         for (i=0; i<hardware_p->nr_boards; i++) {
 214                 candev=hardware_p->candevice[i];
 215                 if (candev->hwspecops->request_io(candev))
 216                         goto memory_error;
 217                 candev->flags|=CANDEV_IO_RESERVED;
 218         }
 219
 220         for (i=0; i<hardware_p->nr_boards; i++) {
 221                 candev=hardware_p->candevice[i];
 222                 if (candev->hwspecops->reset(candev))
 223                         goto reset_error;
 224         }
 225
 226         can_spin_lock_init(&hardware_p->rtr_lock);
 227         hardware_p->rtr_queue=NULL;
 228
 229         for (i=0; i<hardware_p->nr_boards; i++) {
 230                 candev=hardware_p->candevice[i];
 231                 for(j=0; j<candev->nr_all_chips; j++) {
 232                         if((chip=candev->chip[j])==NULL)
 233                                 continue;
 234                         if(can_chip_setup_irq(chip)<0) {
 235                                 CANMSG("IRQ setup failed\n");
 236                                 goto interrupt_error;
 237                         }
 238                 }
 239
 240                 if (candev->flags & CANDEV_PROGRAMMABLE_IRQ)
 241                         if (candev->hwspecops->program_irq(candev))
 242                                 goto interrupt_error;
 243         }
 244
 245 #ifdef CONFIG_PROC_FS
 246         if (can_init_procdir())
 247                 goto proc_error;
 248 #endif
 249
 250 #ifdef CONFIG_DEVFS_FS
 251         {
 252                 char dev_name[32];
 253                 int dev_minor;
 254                 for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 255                         if(!objects_p[i]) continue;
 256                         dev_minor=objects_p[i]->minor;
 257                     #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 258                         sprintf (dev_name, "can%d", dev_minor);
 259                         devfs_handles[i]=devfs_register(NULL, dev_name,
 260                                 DEVFS_FL_DEFAULT, major, dev_minor,
 261                                 S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP,
 262                                 &can_fops, (void*)objects_p[i]);
 263                     #else
 264                         devfs_mk_cdev(MKDEV(major, dev_minor), S_IFCHR | S_IRUGO | S_IWUGO, "can%d", dev_minor);
 265                     #endif
 266                 }
 267         }
 268 #endif
 269         return 0;
 270
 271 #ifdef CONFIG_PROC_FS
 272         proc_error: ;
 273                 CANMSG("Error registering /proc entry.\n");
 274                 goto memory_error;
 275 #endif
 276
 277         interrupt_error: ;
 278                 CANMSG("Error registering interrupt line.\n");
 279                 goto memory_error;
 280
 281         reset_error: ;
 282                 goto memory_error;
 283
 284         memory_error: ;
 285                 canhardware_done(hardware_p);
 286
 287                 #ifdef CAN_WITH_RTL
 288                 rtl_unregister_rtldev(major,DEVICE_NAME);
 289         rtldev_error:
 290                 canqueue_rtl_done();
 291                 #endif /*CAN_WITH_RTL*/
 292
 293                 res=unregister_chrdev(major,DEVICE_NAME);
 294                 if (res<0)
 295                         CANMSG("Error unloading CAN driver, error: %d\n",res);
 296                 else
 297                         CANMSG("No CAN devices or driver setup error.\n");
 298                 return -ENODEV;
 299
 300 }
 301
 302 void cleanup_module(void)
 303 {
 304         int res=0,i=0;
 305
 306 #ifdef CONFIG_PROC_FS
 307         if (can_delete_procdir())
 308                 CANMSG("Error unregistering /proc/can entry.\n");
 309 #endif
 310
 311 #ifdef CONFIG_DEVFS_FS
 312         for(i=0;i<MAX_TOT_MSGOBJS;i++) {
 313             #if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,5,50))
 314                 if(devfs_handles[i])
 315                         devfs_unregister(devfs_handles[i]);
 316             #else
 317                 int dev_minor;
 318                 if(!objects_p[i]) continue;
 319                 dev_minor=objects_p[i]->minor;
 320                 if(minor>=0)
 321                         devfs_remove("can%d", dev_minor);
 322             #endif
 323         }
 324 #endif
 325
 326         canhardware_done(hardware_p);
 327
 328         #ifdef CAN_WITH_RTL
 329         rtl_unregister_rtldev(major,DEVICE_NAME);
 330         canqueue_rtl_done();
 331         #endif /*CAN_WITH_RTL*/
 332
 333         if ( can_del_mem_list() )
 334                 CANMSG("Error deallocating memory\n");
 335
 336         res=unregister_chrdev(major,DEVICE_NAME);
 337         if (res<0)
 338                 CANMSG("Error unregistering CAN driver, error: %d\n",res);
 339 }