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
/*
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* linux/arch/sh/kernel/adc.c -- SH3 on-chip ADC support
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*
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* Copyright (C) 2004 Andriy Skulysh <askulysh@image.kiev.ua>
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*/
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#include <linux/module.h>
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#include <asm/adc.h>
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#include <asm/io.h>
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int adc_single(unsigned int channel)
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{
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int off;
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unsigned char csr;
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if (channel >= 8) return -1;
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off = (channel & 0x03) << 2;
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csr = ctrl_inb(ADCSR);
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csr = channel | ADCSR_ADST | ADCSR_CKS;
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ctrl_outb(csr, ADCSR);
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do {
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csr = ctrl_inb(ADCSR);
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} while ((csr & ADCSR_ADF) == 0);
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csr &= ~(ADCSR_ADF | ADCSR_ADST);
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ctrl_outb(csr, ADCSR);
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return (((ctrl_inb(ADDRAH + off) << 8) |
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ctrl_inb(ADDRAL + off)) >> 6);
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}
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EXPORT_SYMBOL(adc_single);
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