linux_kernel/drivers/usb/renesas_usbhs/rcar2.c

/*
 * Renesas USB driver R-Car Gen. 2 initialization and power control
 *
 * Copyright (C) 2014 Ulrich Hecht
 *
 * 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/gpio.h>
#include <linux/of_gpio.h>
#include <linux/platform_data/gpio-rcar.h>
#include <linux/usb/phy.h>
#include "common.h"
#include "rcar2.h"

static int usbhs_rcar2_hardware_init(struct platform_device *pdev)
{
	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
	struct usb_phy *phy;

	phy = usb_get_phy_dev(&pdev->dev, 0);
	if (IS_ERR(phy))
		return PTR_ERR(phy);

	priv->phy = phy;
	return 0;
}

static int usbhs_rcar2_hardware_exit(struct platform_device *pdev)
{
	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);

	if (!priv->phy)
		return 0;

	usb_put_phy(priv->phy);
	priv->phy = NULL;

	return 0;
}

static int usbhs_rcar2_power_ctrl(struct platform_device *pdev,
				void __iomem *base, int enable)
{
	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);

	if (!priv->phy)
		return -ENODEV;

	if (enable) {
		int retval = usb_phy_init(priv->phy);

		if (!retval)
			retval = usb_phy_set_suspend(priv->phy, 0);
		return retval;
	}

	usb_phy_set_suspend(priv->phy, 1);
	usb_phy_shutdown(priv->phy);
	return 0;
}

static int usbhs_rcar2_get_id(struct platform_device *pdev)
{
	return USBHS_GADGET;
}

const struct renesas_usbhs_platform_callback usbhs_rcar2_ops = {
	.hardware_init = usbhs_rcar2_hardware_init,
	.hardware_exit = usbhs_rcar2_hardware_exit,
	.power_ctrl = usbhs_rcar2_power_ctrl,
	.get_id = usbhs_rcar2_get_id,
};