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/*
* include/linux/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/extcon.h>
/**
* struct adc_jack_data - internal data for adc_jack device driver
* @edev - extcon device.
* @cable_names - list of supported cables.
* @num_cables - size of cable_names.
* @adc_condition - list of adc value conditions.
* @num_condition - size of adc_condition.
* @irq - irq number of attach/detach event (0 if not exist).
* @handling_delay - interrupt handler will schedule extcon event
* handling at handling_delay jiffies.
* @handler - extcon event handler called by interrupt handler.
* @get_adc - a callback to get ADC value to identify state.
* @ready - true if it is safe to run handler.
*/
struct adc_jack_data {
struct extcon_dev edev;
const char **cable_names;
int num_cables;
struct adc_jack_cond *adc_condition;
int num_conditions;
int irq;
unsigned long handling_delay; /* in jiffies */
struct delayed_work handler;
int (*get_adc)(u32 *value);
bool ready;
};
/**
* 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.
* @cable_names - array of cable names ending with null. If the array itself
* if null, extcon standard cable names are chosen.
* @adc_contition - array of struct adc_jack_cond conditions ending
* with .state = 0 entry. This describes how to decode
* adc values into extcon state.
* @irq - IRQ number that is triggerred by cable attach/detach
* events. If irq = 0, use should manually update extcon state
* with extcon APIs.
* @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.
* @get_adc - the callback to read ADC value to identify cable states.
*/
struct adc_jack_pdata {
const char *name;
/*
* NULL if standard extcon names are used.
* The last entry should be NULL
*/
const char **cable_names;
/* The last entry's state should be 0 */
struct adc_jack_cond *adc_condition;
int irq; /* Jack insertion/removal interrupt */
unsigned long irq_flags;
unsigned long handling_delay_ms; /* in ms */
/* When we have ADC subsystem, this can be generalized. */
int (*get_adc)(u32 *value);
};
#endif /* _EXTCON_ADC_JACK_H */
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