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lddbus×ÓϵͳÉùÃ÷ÁËÒ»¸öbus_type½á¹¹£¬³ÆÎªldd_bus_type ¡£Ô´ÂëÊÇÔÚ±àÒëʱ³õʼ»¯ÁËÕâ¸ö½á¹¹Ì壬ԴÂ룺
/*
 * And the bus type.
 */
struct bus_type ldd_bus_type = {
    .name = "ldd",
    .match = ldd_match,
    .uevent  = ldd_uevent,
};
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static int __init ldd_bus_init(void)
{
    int ret;
    ret = bus_register(&ldd_bus_type); /*×¢²á×ÜÏߣ¬ÔÚµ÷ÓÃÕâ¸öº¯ÊýÖ®ºóldd_bus_type ½á¹¹Ì彫ÏòÄÚºË×¢²á£¬ÔÚ/sys/busÖгöÏÖlddÎļþ¼Ð£¬ÆäÖаüº¬Á½¸öĿ¼£ºdevices ºÍ drivers */
    if (ret)
        return ret;
    if (bus_create_file(&ldd_bus_type, &bus_attr_version)) /*Ìí¼Ó×ÜÏßÊôÐÔ,½«ÔÚ/sys/bus/lddĿ¼ÖгöÏÖversionÊôÐÔÎļþ*/
        printk(KERN_NOTICE "Unable to create version attribute ! \n");
    ret = device_register(&ldd_bus);/*½«×ÜÏß×÷ΪÉ豸ע²á¡£ÒòΪ×ÜÏßÒ²¿ÉÒÔÊÇÒ»¸öÉ豸£¬±ÈÈçÔÚS3C2440ÖÐSPI×ÜÏß¿ØÖÆÆ÷Ïà¶ÔÓÚARM920TºËÐÄÀ´Ëµ£¬Æäʵ¾ÍÊÇÒ»¸öÍâÉè¡£µ÷Óô˺¯Êýºó£¬¾Í»áÔÚ/sys/devicesÖгöÏÖldd0Ŀ¼*/
    if (ret)
        printk(KERN_NOTICE "Unable to register ldd0 ! \n");
    
    printk(KERN_NOTICE "Mount lddbus ok


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