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9840354f RQ |
1 | /** |
2 | * drd.c - DesignWare USB3 DRD Controller Dual-role support | |
3 | * | |
4 | * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com | |
5 | * | |
6 | * Authors: Roger Quadros <rogerq@ti.com> | |
7 | * | |
8 | * This program is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 of | |
10 | * the License as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
20 | ||
21 | #include <linux/extcon.h> | |
22 | ||
23 | #include "debug.h" | |
24 | #include "core.h" | |
25 | #include "gadget.h" | |
26 | ||
27 | static void dwc3_drd_update(struct dwc3 *dwc) | |
28 | { | |
29 | int id; | |
30 | ||
31 | id = extcon_get_state(dwc->edev, EXTCON_USB_HOST); | |
32 | if (id < 0) | |
33 | id = 0; | |
34 | ||
35 | dwc3_set_mode(dwc, id ? | |
36 | DWC3_GCTL_PRTCAP_HOST : | |
37 | DWC3_GCTL_PRTCAP_DEVICE); | |
38 | } | |
39 | ||
40 | static int dwc3_drd_notifier(struct notifier_block *nb, | |
41 | unsigned long event, void *ptr) | |
42 | { | |
43 | struct dwc3 *dwc = container_of(nb, struct dwc3, edev_nb); | |
44 | ||
45 | dwc3_set_mode(dwc, event ? | |
46 | DWC3_GCTL_PRTCAP_HOST : | |
47 | DWC3_GCTL_PRTCAP_DEVICE); | |
48 | ||
49 | return NOTIFY_DONE; | |
50 | } | |
51 | ||
52 | int dwc3_drd_init(struct dwc3 *dwc) | |
53 | { | |
54 | int ret; | |
55 | ||
56 | if (dwc->dev->of_node) { | |
57 | if (of_property_read_bool(dwc->dev->of_node, "extcon")) | |
58 | dwc->edev = extcon_get_edev_by_phandle(dwc->dev, 0); | |
59 | ||
60 | if (IS_ERR(dwc->edev)) | |
61 | return PTR_ERR(dwc->edev); | |
62 | ||
63 | dwc->edev_nb.notifier_call = dwc3_drd_notifier; | |
64 | ret = extcon_register_notifier(dwc->edev, EXTCON_USB_HOST, | |
65 | &dwc->edev_nb); | |
66 | if (ret < 0) { | |
67 | dev_err(dwc->dev, "couldn't register cable notifier\n"); | |
68 | return ret; | |
69 | } | |
70 | } | |
71 | ||
72 | dwc3_drd_update(dwc); | |
73 | ||
74 | return 0; | |
75 | } | |
76 | ||
77 | void dwc3_drd_exit(struct dwc3 *dwc) | |
78 | { | |
79 | extcon_unregister_notifier(dwc->edev, EXTCON_USB_HOST, | |
80 | &dwc->edev_nb); | |
81 | ||
82 | dwc3_set_mode(dwc, DWC3_GCTL_PRTCAP_DEVICE); | |
83 | flush_work(&dwc->drd_work); | |
84 | dwc3_gadget_exit(dwc); | |
85 | } |