1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __USB_TYPEC_DP_H
3 #define __USB_TYPEC_DP_H
4
5 #include <linux/usb/typec_altmode.h>
6
7 #define USB_TYPEC_DP_SID 0xff01
8 /* USB IF has not assigned a Standard ID (SID) for VirtualLink,
9 * so the manufacturers of VirtualLink adapters use their Vendor
10 * IDs as the SVID.
11 */
12 #define USB_TYPEC_NVIDIA_VLINK_SID 0x955 /* NVIDIA VirtualLink */
13 #define USB_TYPEC_DP_MODE 1
14
15 /*
16 * Connector states matching the pin assignments in DisplayPort Alt Mode
17 * Specification.
18 *
19 * These values are meant primarily to be used by the mux drivers, but they are
20 * also used as the "value" part in the alternate mode notification chain, so
21 * receivers of those notifications will always see them.
22 *
23 * Note. DisplayPort USB Type-C Alt Mode Specification version 1.0b deprecated
24 * pin assignments A, B and F, but they are still defined here for legacy
25 * purposes.
26 */
27 enum {
28 TYPEC_DP_STATE_A = TYPEC_STATE_MODAL, /* Not supported after v1.0b */
29 TYPEC_DP_STATE_B, /* Not supported after v1.0b */
30 TYPEC_DP_STATE_C,
31 TYPEC_DP_STATE_D,
32 TYPEC_DP_STATE_E,
33 TYPEC_DP_STATE_F, /* Not supported after v1.0b */
34 };
35
36 /*
37 * struct typec_displayport_data - DisplayPort Alt Mode specific data
38 * @status: Status Update command VDO content
39 * @conf: Configure command VDO content
40 *
41 * This structure is delivered as the data part with the notifications. It
42 * contains the VDOs from the two DisplayPort Type-C alternate mode specific
43 * commands: Status Update and Configure.
44 *
45 * @status will show for example the status of the HPD signal.
46 */
47 struct typec_displayport_data {
48 u32 status;
49 u32 conf;
50 };
51
52 enum {
53 DP_PIN_ASSIGN_A, /* Not supported after v1.0b */
54 DP_PIN_ASSIGN_B, /* Not supported after v1.0b */
55 DP_PIN_ASSIGN_C,
56 DP_PIN_ASSIGN_D,
57 DP_PIN_ASSIGN_E,
58 DP_PIN_ASSIGN_F, /* Not supported after v1.0b */
59 };
60
61 /* DisplayPort alt mode specific commands */
62 #define DP_CMD_STATUS_UPDATE VDO_CMD_VENDOR(0)
63 #define DP_CMD_CONFIGURE VDO_CMD_VENDOR(1)
64
65 /* DisplayPort Capabilities VDO bits (returned with Discover Modes) */
66 #define DP_CAP_CAPABILITY(_cap_) ((_cap_) & 3)
67 #define DP_CAP_UFP_D 1
68 #define DP_CAP_DFP_D 2
69 #define DP_CAP_DFP_D_AND_UFP_D 3
70 #define DP_CAP_DP_SIGNALING BIT(2) /* Always set */
71 #define DP_CAP_GEN2 BIT(3) /* Reserved after v1.0b */
72 #define DP_CAP_RECEPTACLE BIT(6)
73 #define DP_CAP_USB BIT(7)
74 #define DP_CAP_DFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(15, 8)) >> 8)
75 #define DP_CAP_UFP_D_PIN_ASSIGN(_cap_) (((_cap_) & GENMASK(23, 16)) >> 16)
76
77 /* DisplayPort Status Update VDO bits */
78 #define DP_STATUS_CONNECTION(_status_) ((_status_) & 3)
79 #define DP_STATUS_CON_DISABLED 0
80 #define DP_STATUS_CON_DFP_D 1
81 #define DP_STATUS_CON_UFP_D 2
82 #define DP_STATUS_CON_BOTH 3
83 #define DP_STATUS_POWER_LOW BIT(2)
84 #define DP_STATUS_ENABLED BIT(3)
85 #define DP_STATUS_PREFER_MULTI_FUNC BIT(4)
86 #define DP_STATUS_SWITCH_TO_USB BIT(5)
87 #define DP_STATUS_EXIT_DP_MODE BIT(6)
88 #define DP_STATUS_HPD_STATE BIT(7) /* 0 = HPD_Low, 1 = HPD_High */
89 #define DP_STATUS_IRQ_HPD BIT(8)
90
91 /* DisplayPort Configurations VDO bits */
92 #define DP_CONF_CURRENTLY(_conf_) ((_conf_) & 3)
93 #define DP_CONF_UFP_U_AS_DFP_D BIT(0)
94 #define DP_CONF_UFP_U_AS_UFP_D BIT(1)
95 #define DP_CONF_SIGNALING_DP BIT(2)
96 #define DP_CONF_SIGNALING_GEN_2 BIT(3) /* Reserved after v1.0b */
97 #define DP_CONF_PIN_ASSIGNEMENT_SHIFT 8
98 #define DP_CONF_PIN_ASSIGNEMENT_MASK GENMASK(15, 8)
99
100 /* Helper for setting/getting the pin assignement value to the configuration */
101 #define DP_CONF_SET_PIN_ASSIGN(_a_) ((_a_) << 8)
102 #define DP_CONF_GET_PIN_ASSIGN(_conf_) (((_conf_) & GENMASK(15, 8)) >> 8)
103
104 #endif /* __USB_TYPEC_DP_H */