72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
|
/*
|
||
|
|
* 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 cable names ending with null.
|
||
|
|
* @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;
|
||
|
|
/*
|
||
|
|
* The last entry should be NULL
|
||
|
|
*/
|
||
|
|
const char **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 */
|