c - How to forward a generic resource/data of platform_device to a driver -

i have platform_device instance , want pass function pointer, wondering cleanest , generic way doing it.

the optimal thing if had misc resource in kernel can pass void* whatever want available resources:

 31 #define ioresource_type_bits    0x00001f00      /* resource type */  32 #define ioresource_io           0x00000100      /* pci/isa i/o ports */  33 #define ioresource_mem          0x00000200  34 #define ioresource_reg          0x00000300      /* register offsets */  35 #define ioresource_irq          0x00000400  36 #define ioresource_dma          0x00000800  37 #define ioresource_bus          0x00001000 

actually have container platform device allocated , initialized dynamically in probe function.

my question how pass generic pointer resource device ? or how can in cleanest way?

use platform_data described @ bottom of lwn article link in question. in case, data structure this. untested, idea. platform_data struct hold function pointers, set @ same time define particulars of device.

int sleep_function_chip1(struct platform_device *pdev) {     // go sleep     return 0; } int resume_function_chip1(struct platform_device *pdev) {     // resume     return 0; }  struct my_platform_data {     int (*sleep_function)(struct platform_device *);     int (*resume_function)(struct platform_device *); };  // instance of my_platform_data particular hardware (called chip1 now) static struct my_platform_data my_platform_data_chip1 = {     .sleep_function  = &sleep_function_chip1,     .resume_function = &resume_function_chip1, };  // second instance of my_platform_data different hardware (called chip2 now) static struct my_platform_data my_platform_data_chip2 = {     .sleep_function  = &sleep_function_chip2,     .resume_function = &resume_function_chip2, };  // include data when create descriptor // platform static struct platform_device my_platform_device_chip1 = {     .name       = "my_device",     .id     = 0,     .dev = {         .platform_data = &my_platform_data_chip1,     } };  int some_driver_function() {     struct platform_device *pdev;     pdev = // wherever store      // time need data, extract platform_data pointer     struct my_platform_data *pd = (struct my_platform_data*)pdev->dev.platform_data;      // call function pointer     pd->sleep_function(pdev); }