path: root/drivers/extcon/extcon-max77693.c

/*
 * extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC
 *
 * Copyright (C) 2012 Samsung Electrnoics
 * Chanwoo Choi <cw00.choi@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/max77693.h>
#include <linux/mfd/max77693-private.h>
#include <linux/extcon.h>
#include <linux/regmap.h>
#include <linux/irqdomain.h>

#define	DEV_NAME			"max77693-muic"
#define	DELAY_MS_DEFAULT		20000		/* unit: millisecond */

enum max77693_muic_adc_debounce_time {
	ADC_DEBOUNCE_TIME_5MS = 0,
	ADC_DEBOUNCE_TIME_10MS,
	ADC_DEBOUNCE_TIME_25MS,
	ADC_DEBOUNCE_TIME_38_62MS,
};

struct max77693_muic_info {
	struct device *dev;
	struct max77693_dev *max77693;
	struct extcon_dev *edev;
	int prev_cable_type;
	int prev_cable_type_gnd;
	int prev_chg_type;
	int prev_button_type;
	u8 status[2];

	int irq;
	struct work_struct irq_work;
	struct mutex mutex;

	/*
	 * Use delayed workqueue to detect cable state and then
	 * notify cable state to notifiee/platform through uevent.
	 * After completing the booting of platform, the extcon provider
	 * driver should notify cable state to upper layer.
	 */
	struct delayed_work wq_detcable;

	/* Button of dock device */
	struct input_dev *dock;

	/*
	 * Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
	 * h/w path of COMP2/COMN1 on CONTROL1 register.
	 */
	int path_usb;
	int path_uart;
};

enum max77693_muic_cable_group {
	MAX77693_CABLE_GROUP_ADC = 0,
	MAX77693_CABLE_GROUP_ADC_GND,
	MAX77693_CABLE_GROUP_CHG,
	MAX77693_CABLE_GROUP_VBVOLT,
};

enum max77693_muic_charger_type {
	MAX77693_CHARGER_TYPE_NONE = 0,
	MAX77693_CHARGER_TYPE_USB,
	MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT,
	MAX77693_CHARGER_TYPE_DEDICATED_CHG,
	MAX77693_CHARGER_TYPE_APPLE_500MA,
	MAX77693_CHARGER_TYPE_APPLE_1A_2A,
	MAX77693_CHARGER_TYPE_DEAD_BATTERY = 7,
};

/**
 * struct max77693_muic_irq
 * @irq: the index of irq list of MUIC device.
 * @name: the name of irq.
 * @virq: the virtual irq to use irq domain
 */
struct max77693_muic_irq {
	unsigned int irq;
	const char *name;
	unsigned int virq;
};

static struct max77693_muic_irq muic_irqs[] = {
	{ MAX77693_MUIC_IRQ_INT1_ADC,		"muic-ADC" },
	{ MAX77693_MUIC_IRQ_INT1_ADC_LOW,	"muic-ADCLOW" },
	{ MAX77693_MUIC_IRQ_INT1_ADC_ERR,	"muic-ADCError" },
	{ MAX77693_MUIC_IRQ_INT1_ADC1K,		"muic-ADC1K" },
	{ MAX77693_MUIC_IRQ_INT2_CHGTYP,	"muic-CHGTYP" },
	{ MAX77693_MUIC_IRQ_INT2_CHGDETREUN,	"muic-CHGDETREUN" },
	{ MAX77693_MUIC_IRQ_INT2_DCDTMR,	"muic-DCDTMR" },
	{ MAX77693_MUIC_IRQ_INT2_DXOVP,		"muic-DXOVP" },
	{ MAX77693_MUIC_IRQ_INT2_VBVOLT,	"muic-VBVOLT" },
	{ MAX77693_MUIC_IRQ_INT2_VIDRM,		"muic-VIDRM" },
	{ MAX77693_MUIC_IRQ_INT3_EOC,		"muic-EOC" },
	{ MAX77693_MUIC_IRQ_INT3_CGMBC,		"muic-CGMBC" },
	{ MAX77693_MUIC_IRQ_INT3_OVP,		"muic-OVP" },
	{ MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,	"muic-MBCCHG_ERR" },
	{ MAX77693_MUIC_IRQ_INT3_CHG_ENABL