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 */

/*
 * Default value of MAX77693 register to bring up MUIC device.
 * If user don't set some initial value for MUIC device through platform data,
 * extcon-max77693 driver use 'default_init_data' to bring up base operation
 * of MAX77693 MUIC device.
 */
static struct max77693_reg_data default_init_data[] = {
	{
		/* STATUS2 - [3]ChgDetRun */
		.addr = MAX77693_MUIC_REG_STATUS2,
		.data = STATUS2_CHGDETRUN_MASK,
	}, {
		/* INTMASK1 - Unmask [3]ADC1KM,[0]ADCM */
		.addr = MAX77693_MUIC_REG_INTMASK1,
		.data = INTMASK1_ADC1K_MASK
			| INTMASK1_ADC_MASK,
	}, {
		/* INTMASK2 - Unmask [0]ChgTypM */
		.addr = MAX77693_MUIC_REG_INTMASK2,
		.data = INTMASK2_CHGTYP_MASK,
	}, {
		/* INTMASK3 - Mask all of interrupts */
		.addr = MAX77693_MUIC_REG_INTMASK3,
		.data = 0x0,
	}, {
		/* CDETCTRL2 */
		.addr = MAX77693_MUIC_REG_CDETCTRL2,
		.data = CDETCTRL2_VIDRMEN_MASK
			| CDETCTRL2_DXOVPEN_MASK,
	},
};

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_ch