72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/*
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* include/linux/extcon/extcon-adc-jack.h
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*
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* Analog Jack extcon driver with ADC-based detection capability.
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*
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* Copyright (C) 2012 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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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 _EXTCON_ADC_JACK_H_
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#define _EXTCON_ADC_JACK_H_ __FILE__
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#include <linux/module.h>
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#include <linux/extcon.h>
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/**
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* struct adc_jack_cond - condition to use an extcon state
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* @state: the corresponding extcon state (if 0, this struct
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* denotes the last adc_jack_cond element among the array)
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* @min_adc: min adc value for this condition
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* @max_adc: max adc value for this condition
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*
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* For example, if { .state = 0x3, .min_adc = 100, .max_adc = 200}, it means
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* that if ADC value is between (inclusive) 100 and 200, than the cable 0 and
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* 1 are attached (1<<0 | 1<<1 == 0x3)
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*
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* Note that you don't need to describe condition for "no cable attached"
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* because when no adc_jack_cond is met, state = 0 is automatically chosen.
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*/
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struct adc_jack_cond {
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u32 state; /* extcon state value. 0 if invalid */
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u32 min_adc;
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u32 max_adc;
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};
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/**
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* struct adc_jack_pdata - platform data for adc jack device.
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* @name: name of the extcon device. If null, "adc-jack" is used.
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* @consumer_channel: Unique name to identify the channel on the consumer
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* side. This typically describes the channels used within
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* the consumer. E.g. 'battery_voltage'
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* @cable_names: array of cable names ending with null.
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* @adc_contitions: array of struct adc_jack_cond conditions ending
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* with .state = 0 entry. This describes how to decode
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* adc values into extcon state.
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* @irq_flags: irq flags used for the @irq
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* @handling_delay_ms: in some devices, we need to read ADC value some
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* milli-seconds after the interrupt occurs. You may
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* describe such delays with @handling_delay_ms, which
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* is rounded-off by jiffies.
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*/
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struct adc_jack_pdata {
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const char *name;
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const char *consumer_channel;
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/* The last entry should be NULL */
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const char **cable_names;
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/* The last entry's state should be 0 */
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struct adc_jack_cond *adc_conditions;
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unsigned long irq_flags;
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unsigned long handling_delay_ms; /* in ms */
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};
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#endif /* _EXTCON_ADC_JACK_H */
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