should i write functions myself?

[Altera_Forum]

wentao and clansdown: 

  i want to use sl811hs,and select it in kernel ,should i write 4 functions myself??   1. char SL811Read (hci_t * hci, char offset)  {  hcipriv_t *hp = &hci->hp;  char data;  writeb (offset, hp->hcport);  wmb ();  data = readb (hp->hcport2);  rmb ();  return (data);  }  2.void SL811Write (hci_t * hci, char offset, char data)  3.void SL811BufRead (hci_t * hci, short offset, char *buf, short size)  4.void SL811BufWrite (hci_t * hci, short offset, char *buf, short size)

[Altera_Forum]

and when i build the kernel, here were some error: 

 error: `GPDR' undeclared (first use in this function)[/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_0.1.5/linux2.6.x/drivers/usb/host/hc_sl811.c] kernel_0416 line 1229   error: `GPIO_RISING_EDGE' undeclared (first use in this function)[/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_0.1.5/linux-2.6.x/drivers/usb/host/hc_sl811.c] kernel_0416 line 1230   error: (Each undeclared identifier is reported only once[/cygdrive/d/altera/kits/nios2/bin/eclipse/plugins/com.microtronix.nios2linux.kernel_0.1.5/linux-2.6.x/drivers/usb/host/hc_sl811.c] kernel_0416 line 1229   i find "GPIO_RISING_EDGE"and "GPDR" in sl811hs.c , but the program never defined them. why???

[Altera_Forum]

From what I gather from wentao, this driver takes a lot of work and is a dead end anyway because it's been superceded by the sl811-hcd driver from mainline 2.6.10. See the other thread for a basic idea of the steps to get that driver working.