pointer

/*
   아들 교육자료
   pointer 사용 예제
*/

struct device {
 struct klist  klist_children;
 struct klist_node knode_parent;  /* node in sibling list */
 struct klist_node knode_driver;
 struct klist_node knode_bus;
 struct device  * parent;

 struct kobject kobj;
 char bus_id[BUS_ID_SIZE]; /* position on parent bus */

 struct semaphore sem;     /* semaphore to synchronize calls to
                            * its driver.
                            */

 struct bus_type * bus;        /* type of bus device is on */
 struct device_driver *driver; /* which driver has allocated this device  */
 void  *driver_data;           /* data private to the driver */
 void  *platform_data;         /* Platform specific data, device
                                  core doesn't touch it */
 void  *firmware_data;         /* Firmware specific data (e.g. ACPI,
                                  BIOS data),reserved for device core*/
 struct dev_pm_info power;

 u64  *dma_mask;               /* dma mask (if dma'able device) */
 u64  coherent_dma_mask;       /* Like dma_mask, but for
                                  alloc_coherent mappings as
                                  not all hardware supports
                                  64 bit addresses for consistent
                                  allocations such descriptors. 
                                */

 struct list_head dma_pools;    /* dma pools (if dma'ble) */
 struct dma_coherent_mem *dma_mem;    /* internal for coherent mem override */
 void (*release)(struct device * dev);
};


struct platform_device {
 const char * name;
 u32  id;
 struct device dev;
 u32  num_resources;
 struct resource * resource;
};

struct devicemodel_data {
    char *greeting;
    int number;
};

static int devicemodel_probe(struct platform_device *dev)
{
    struct devicemodel_data *pd =
        (struct devicemodel_data *)(dev->dev.platform_data);

    pr_info("devicemodel probe\n");
    pr_info("devicemodel greeting: %s; %d\n", pd->greeting, pd->number);

    /* Your device initialization code */

    return 0;
}