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68 lines
2.2 KiB
68 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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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 <[email protected]> |
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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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* denotes the last adc_jack_cond element among the array) |
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* @id: the unique id of each external connector |
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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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unsigned int id; |
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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 extcon id for supported cables. |
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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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* @wakeup_source: flag to wake up the system for extcon events. |
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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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const unsigned int *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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bool wakeup_source; |
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}; |
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#endif /* _EXTCON_ADC_JACK_H */
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