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82 lines
2.2 KiB
C
Executable File
82 lines
2.2 KiB
C
Executable File
/* include/linux/adc.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __ASM_ADC_CORE_H
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#define __ASM_ADC_CORE_H
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#include <linux/list.h>
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#include <linux/wait.h>
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enum host_chn_shift{
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SARADC_CHN_SHIFT = 0,
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CUSTOM_CHN_SHIFT = 28
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};
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enum host_chn_mask{
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SARADC_CHN_MASK = 0x0000000f, // saradc: 0 -- 15
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CUSTOM_CHN_MASK = 0xf0000000,
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};
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struct adc_host;
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struct adc_client {
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unsigned int index;
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unsigned int chn;
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unsigned int is_finished;
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unsigned int flags;
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int result;
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struct adc_host *adc;
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struct list_head list;
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wait_queue_head_t wait;
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void (*callback)(struct adc_client *, void *, int);
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void *callback_param;
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};
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#ifdef CONFIG_ADC
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struct adc_client *adc_register(int chn,
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void (*callback)(struct adc_client *, void *, int),
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void *callback_param);
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void adc_unregister(struct adc_client *client);
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/*
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* function: adc_sync_read
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* 1)return value:
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* if correct, return adc sample value;
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* if error, return negative;
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*/
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int adc_sync_read(struct adc_client *client);
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/*
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* function: adc_async_read
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* 1)return value: if error, return negative; else return 0;
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* 2)adc sample value: the third parameter of callback.
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* if timeout, sample value is -1; else sample value is non-negative
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*/
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int adc_async_read(struct adc_client *client);
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/*
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* function: return current reference voltage, unit: mV
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*/
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int adc_get_curr_ref_volt(void);
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/*
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* function: return default reference voltage, unit: mV
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*/
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int adc_get_def_ref_volt(void);
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#else
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static inline struct adc_client *adc_register(int chn,
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void (*callback)(struct adc_client *, void *, int),
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void *callback_param)
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{
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return NULL;
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}
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static inline void adc_unregister(struct adc_client *client) {}
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static inline int adc_sync_read(struct adc_client *client) { return -1; }
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static inline int adc_async_read(struct adc_client *client) { return -1; }
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static inline int adc_get_curr_ref_volt(void) { return -1; }
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static inline int adc_get_def_ref_volt(void) { return -1; }
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#endif
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#endif
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