// SPDX-License-Identifier: GPL-2.0/* * 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 = __raw_readb(ADCSR);	csr = channel | ADCSR_ADST | ADCSR_CKS;	__raw_writeb(csr, ADCSR); 	do {		csr = __raw_readb(ADCSR);	} while ((csr & ADCSR_ADF) == 0); 	csr &= ~(ADCSR_ADF | ADCSR_ADST);	__raw_writeb(csr, ADCSR); 	return (((__raw_readb(ADDRAH + off) << 8) |		__raw_readb(ADDRAL + off)) >> 6);} EXPORT_SYMBOL(adc_single);