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