linux-imx

/*

 * Palmas USB transceiver driver

 *

 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.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.

 *

 * Author: Graeme Gregory <gg@slimlogic.co.uk>

 * Author: Kishon Vijay Abraham I <kishon@ti.com>

 *

 * Based on twl6030_usb.c

 *

 * Author: Hema HK <hemahk@ti.com>

 *

 * 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/module.h>

#include <linux/interrupt.h>

#include <linux/platform_device.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/mfd/palmas.h>

#include <linux/of.h>

#include <linux/of_platform.h>

#include <linux/of_gpio.h>

#include <linux/gpio/consumer.h>

#include <linux/workqueue.h>

​

#define USB_GPIO_DEBOUNCE_MS    20  /* ms */

​

static const unsigned int palmas_extcon_cable[] = {

    EXTCON_USB,

    EXTCON_USB_HOST,

    EXTCON_NONE,

};

​

static void palmas_usb_wakeup(struct palmas *palmas, int enable)

{

    if (enable)

        palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP,

            PALMAS_USB_WAKEUP_ID_WK_UP_COMP);

    else

        palmas_write(palmas, PALMAS_USB_OTG_BASE, PALMAS_USB_WAKEUP, 0);

}

​

static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)

{

    struct palmas_usb *palmas_usb = _palmas_usb;

    struct extcon_dev *edev = palmas_usb->edev;

    unsigned int vbus_line_state;

​

    palmas_read(palmas_usb->palmas, PALMAS_INTERRUPT_BASE,

        PALMAS_INT3_LINE_STATE, &vbus_line_state);

​

    if (vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS) {

        if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {

            palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;

            extcon_set_state_sync(edev, EXTCON_USB, true);

            dev_dbg(palmas_usb->dev, "USB cable is attached\n");

        } else {

            dev_dbg(palmas_usb->dev,

                "Spurious connect event detected\n");

        }

    } else if (!(vbus_line_state & PALMAS_INT3_LINE_STATE_VBUS)) {

        if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {

            palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;

            extcon_set_state_sync(edev, EXTCON_USB, false);

            dev_dbg(palmas_usb->dev, "USB cable is detached\n");

        } else {

            dev_dbg(palmas_usb->dev,

                "Spurious disconnect event detected\n");

        }

    }

​

    return IRQ_HANDLED;

}

​

static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)

{

    unsigned int set, id_src;

    struct palmas_usb *palmas_usb = _palmas_usb;

    struct extcon_dev *edev = palmas_usb->edev;

​

    palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,

        PALMAS_USB_ID_INT_LATCH_SET, &set);

    palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,