extcon-adc-jack.h
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/*
* include/linux/extcon/extcon-adc-jack.h
*
* Analog Jack extcon driver with ADC-based detection capability.
*
* Copyright (C) 2012 Samsung Electronics
* MyungJoo Ham <myungjoo.ham@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#ifndef _EXTCON_ADC_JACK_H_
#define _EXTCON_ADC_JACK_H_ __FILE__
#include <linux/module.h>
#include <linux/extcon.h>
/**
* struct adc_jack_cond - condition to use an extcon state
* @state: the corresponding extcon state (if 0, this struct
* denotes the last adc_jack_cond element among the array)
* @min_adc: min adc value for this condition
* @max_adc: max adc value for this condition
*
* For example, if { .state = 0x3, .min_adc = 100, .max_adc = 200}, it means
* that if ADC value is between (inclusive) 100 and 200, than the cable 0 and
* 1 are attached (1<<0 | 1<<1 == 0x3)
*
* Note that you don't need to describe condition for "no cable attached"
* because when no adc_jack_cond is met, state = 0 is automatically chosen.
*/
struct adc_jack_cond {
u32 state; /* extcon state value. 0 if invalid */
u32 min_adc;
u32 max_adc;
};
/**
* struct adc_jack_pdata - platform data for adc jack device.
* @name: name of the extcon device. If null, "adc-jack" is used.
* @consumer_channel: Unique name to identify the channel on the consumer
* side. This typically describes the channels used within
* the consumer. E.g. 'battery_voltage'
* @cable_names: array of extcon id for supported cables.
* @adc_contitions: array of struct adc_jack_cond conditions ending
* with .state = 0 entry. This describes how to decode
* adc values into extcon state.
* @irq_flags: irq flags used for the @irq
* @handling_delay_ms: in some devices, we need to read ADC value some
* milli-seconds after the interrupt occurs. You may
* describe such delays with @handling_delay_ms, which
* is rounded-off by jiffies.
*/
struct adc_jack_pdata {
const char *name;
const char *consumer_channel;
const enum extcon *cable_names;
/* The last entry's state should be 0 */
struct adc_jack_cond *adc_conditions;
unsigned long irq_flags;
unsigned long handling_delay_ms; /* in ms */
};
#endif /* _EXTCON_ADC_JACK_H */