mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-13 23:36:57 +07:00
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
|
/**
|
||
|
|
* drd.c - DesignWare USB3 DRD Controller Dual-role support
|
||
|
|
*
|
||
|
|
* Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com
|
||
|
|
*
|
||
|
|
* Authors: Roger Quadros <rogerq@ti.com>
|
||
|
|
*
|
||
|
|
* This program is free software: you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 of
|
||
|
|
* the License as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/extcon.h>
|
||
|
|
|
||
|
|
#include "debug.h"
|
||
|
|
#include "core.h"
|
||
|
|
#include "gadget.h"
|
||
|
|
|
||
|
|
static void dwc3_drd_update(struct dwc3 *dwc)
|
||
|
|
{
|
||
|
|
int id;
|
||
|
|
|
||
|
|
id = extcon_get_state(dwc->edev, EXTCON_USB_HOST);
|
||
|
|
if (id < 0)
|
||
|
|
id = 0;
|
||
|
|
|
||
|
|
dwc3_set_mode(dwc, id ?
|
||
|
|
DWC3_GCTL_PRTCAP_HOST :
|
||
|
|
DWC3_GCTL_PRTCAP_DEVICE);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int dwc3_drd_notifier(struct notifier_block *nb,
|
||
|
|
unsigned long event, void *ptr)
|
||
|
|
{
|
||
|
|
struct dwc3 *dwc = container_of(nb, struct dwc3, edev_nb);
|
||
|
|
|
||
|
|
dwc3_set_mode(dwc, event ?
|
||
|
|
DWC3_GCTL_PRTCAP_HOST :
|
||
|
|
DWC3_GCTL_PRTCAP_DEVICE);
|
||
|
|
|
||
|
|
return NOTIFY_DONE;
|
||
|
|
}
|
||
|
|
|
||
|
|
int dwc3_drd_init(struct dwc3 *dwc)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (dwc->dev->of_node) {
|
||
|
|
if (of_property_read_bool(dwc->dev->of_node, "extcon"))
|
||
|
|
dwc->edev = extcon_get_edev_by_phandle(dwc->dev, 0);
|
||
|
|
|
||
|
|
if (IS_ERR(dwc->edev))
|
||
|
|
return PTR_ERR(dwc->edev);
|
||
|
|
|
||
|
|
dwc->edev_nb.notifier_call = dwc3_drd_notifier;
|
||
|
|
ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST,
|
||
|
|
&dwc->edev_nb);
|
||
|
|
if (ret < 0) {
|
||
|
|
dev_err(dwc->dev, "couldn't register cable notifier\n");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
dwc3_drd_update(dwc);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void dwc3_drd_exit(struct dwc3 *dwc)
|
||
|
|
{
|
||
|
|
extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST,
|
||
|
|
&dwc->edev_nb);
|
||
|
|
|
||
|
|
dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE);
|
||
|
|
flush_work(&dwc->drd_work);
|
||
|
|
dwc3_gadget_exit(dwc);
|
||
|
|
}
|