linux-imx

/*

 * extcon-rt8973a.c - Richtek RT8973A extcon driver to support USB switches

 *

 * Copyright (c) 2014 Samsung Electronics Co., Ltd

 * Author: 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.

 */

​

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/input.h>

#include <linux/interrupt.h>

#include <linux/irqdomain.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/extcon-provider.h>

​

#include "extcon-rt8973a.h"

​

#define DELAY_MS_DEFAULT        20000   /* unit: millisecond */

​

struct muic_irq {

    unsigned int irq;

    const char *name;

    unsigned int virq;

};

​

struct reg_data {

    u8 reg;

    u8 mask;

    u8 val;

    bool invert;

};

​

struct rt8973a_muic_info {

    struct device *dev;

    struct extcon_dev *edev;

​

    struct i2c_client *i2c;

    struct regmap *regmap;

​

    struct regmap_irq_chip_data *irq_data;

    struct muic_irq *muic_irqs;

    unsigned int num_muic_irqs;

    int irq;

    bool irq_attach;

    bool irq_detach;

    bool irq_ovp;

    bool irq_otp;

    struct work_struct irq_work;

​

    struct reg_data *reg_data;

    unsigned int num_reg_data;

    bool auto_config;

​

    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;

};

​

/* Default value of RT8973A register to bring up MUIC device. */

static struct reg_data rt8973a_reg_data[] = {

    {

        .reg = RT8973A_REG_CONTROL1,

        .mask = RT8973A_REG_CONTROL1_ADC_EN_MASK

            | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK

            | RT8973A_REG_CONTROL1_CHGTYP_MASK

            | RT8973A_REG_CONTROL1_SWITCH_OPEN_MASK

            | RT8973A_REG_CONTROL1_AUTO_CONFIG_MASK

            | RT8973A_REG_CONTROL1_INTM_MASK,

        .val = RT8973A_REG_CONTROL1_ADC_EN_MASK

            | RT8973A_REG_CONTROL1_USB_CHD_EN_MASK

            | RT8973A_REG_CONTROL1_CHGTYP_MASK,

        .invert = false,

    },

    { /* sentinel */ }

};

​

/* List of detectable cables */