mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
37 lines
655 B
C
37 lines
655 B
C
/*
|
|
* linux/arch/sh/kernel/adc.c -- SH3 on-chip ADC support
|
|
*
|
|
* Copyright (C) 2004 Andriy Skulysh <askulysh@image.kiev.ua>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <asm/adc.h>
|
|
#include <asm/io.h>
|
|
|
|
|
|
int adc_single(unsigned int channel)
|
|
{
|
|
int off;
|
|
unsigned char csr;
|
|
|
|
if (channel >= 8) return -1;
|
|
|
|
off = (channel & 0x03) << 2;
|
|
|
|
csr = ctrl_inb(ADCSR);
|
|
csr = channel | ADCSR_ADST | ADCSR_CKS;
|
|
ctrl_outb(csr, ADCSR);
|
|
|
|
do {
|
|
csr = ctrl_inb(ADCSR);
|
|
} while ((csr & ADCSR_ADF) == 0);
|
|
|
|
csr &= ~(ADCSR_ADF | ADCSR_ADST);
|
|
ctrl_outb(csr, ADCSR);
|
|
|
|
return (((ctrl_inb(ADDRAH + off) << 8) |
|
|
ctrl_inb(ADDRAL + off)) >> 6);
|
|
}
|
|
|
|
EXPORT_SYMBOL(adc_single);
|