86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
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/**
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* drd.c - DesignWare USB3 DRD Controller Dual-role support
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*
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* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com
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*
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* Authors: Roger Quadros <rogerq@ti.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/extcon.h>
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#include "debug.h"
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#include "core.h"
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#include "gadget.h"
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static void dwc3_drd_update(struct dwc3 *dwc)
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{
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int id;
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id = extcon_get_state(dwc->edev, EXTCON_USB_HOST);
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if (id < 0)
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id = 0;
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dwc3_set_mode(dwc, id ?
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DWC3_GCTL_PRTCAP_HOST :
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DWC3_GCTL_PRTCAP_DEVICE);
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}
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static int dwc3_drd_notifier(struct notifier_block *nb,
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unsigned long event, void *ptr)
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{
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struct dwc3 *dwc = container_of(nb, struct dwc3, edev_nb);
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dwc3_set_mode(dwc, event ?
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DWC3_GCTL_PRTCAP_HOST :
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DWC3_GCTL_PRTCAP_DEVICE);
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return NOTIFY_DONE;
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}
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int dwc3_drd_init(struct dwc3 *dwc)
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{
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int ret;
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if (dwc->dev->of_node) {
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if (of_property_read_bool(dwc->dev->of_node, "extcon"))
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dwc->edev = extcon_get_edev_by_phandle(dwc->dev, 0);
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if (IS_ERR(dwc->edev))
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return PTR_ERR(dwc->edev);
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dwc->edev_nb.notifier_call = dwc3_drd_notifier;
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ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
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&dwc->edev_nb);
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if (ret < 0) {
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dev_err(dwc->dev, "couldn't register cable notifier\n");
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return ret;
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}
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}
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dwc3_drd_update(dwc);
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return 0;
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}
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void dwc3_drd_exit(struct dwc3 *dwc)
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{
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extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
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&dwc->edev_nb);
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dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
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flush_work(&dwc->drd_work);
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dwc3_gadget_exit(dwc);
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}
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