6af4342b26
This change adds functionality to allow DP client to request to release SS lanes for 4 lane functionality. This is allowed once per USB type C session. Currently there is no other transition between NO LANE <-> 2 LANE <-> 4 LANE allowed. Change-Id: Ia6d6307d424f79ed7df2752e26e118a14c724665 Signed-off-by: Mayank Rana <mrana@codeaurora.org>
164 lines
4.2 KiB
C
164 lines
4.2 KiB
C
/* Copyright (c) 2016-2017, Linux Foundation. All rights reserved.
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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 and
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* only version 2 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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#ifndef __LINUX_USB_USBPD_H
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#define __LINUX_USB_USBPD_H
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#include <linux/list.h>
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struct usbpd;
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/* Standard IDs */
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#define USBPD_SID 0xff00
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/* Structured VDM Command Type */
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enum usbpd_svdm_cmd_type {
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SVDM_CMD_TYPE_INITIATOR,
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SVDM_CMD_TYPE_RESP_ACK,
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SVDM_CMD_TYPE_RESP_NAK,
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SVDM_CMD_TYPE_RESP_BUSY,
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};
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/* Structured VDM Commands */
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#define USBPD_SVDM_DISCOVER_IDENTITY 0x1
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#define USBPD_SVDM_DISCOVER_SVIDS 0x2
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#define USBPD_SVDM_DISCOVER_MODES 0x3
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#define USBPD_SVDM_ENTER_MODE 0x4
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#define USBPD_SVDM_EXIT_MODE 0x5
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#define USBPD_SVDM_ATTENTION 0x6
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/*
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* Implemented by client
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*/
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struct usbpd_svid_handler {
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u16 svid;
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/* Notified when VDM session established/reset; must be implemented */
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void (*connect)(struct usbpd_svid_handler *hdlr);
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void (*disconnect)(struct usbpd_svid_handler *hdlr);
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/* DP driver -> PE driver for requesting USB SS lanes */
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int (*request_usb_ss_lane)(struct usbpd *pd,
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struct usbpd_svid_handler *hdlr);
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/* Unstructured VDM */
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void (*vdm_received)(struct usbpd_svid_handler *hdlr, u32 vdm_hdr,
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const u32 *vdos, int num_vdos);
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/* Structured VDM */
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void (*svdm_received)(struct usbpd_svid_handler *hdlr, u8 cmd,
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enum usbpd_svdm_cmd_type cmd_type, const u32 *vdos,
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int num_vdos);
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/* client should leave these blank; private members used by PD driver */
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struct list_head entry;
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bool discovered;
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};
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enum plug_orientation {
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ORIENTATION_NONE,
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ORIENTATION_CC1,
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ORIENTATION_CC2,
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};
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#if IS_ENABLED(CONFIG_USB_PD_POLICY)
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/*
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* Obtains an instance of usbpd from a DT phandle
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*/
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struct usbpd *devm_usbpd_get_by_phandle(struct device *dev,
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const char *phandle);
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/*
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* Called by client to handle specific SVID messages.
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* Specify callback functions in the usbpd_svid_handler argument
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*/
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int usbpd_register_svid(struct usbpd *pd, struct usbpd_svid_handler *hdlr);
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void usbpd_unregister_svid(struct usbpd *pd, struct usbpd_svid_handler *hdlr);
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/*
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* Transmit a VDM message.
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*/
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int usbpd_send_vdm(struct usbpd *pd, u32 vdm_hdr, const u32 *vdos,
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int num_vdos);
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/*
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* Transmit a Structured VDM message.
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*/
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int usbpd_send_svdm(struct usbpd *pd, u16 svid, u8 cmd,
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enum usbpd_svdm_cmd_type cmd_type, int obj_pos,
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const u32 *vdos, int num_vdos);
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/*
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* Get current status of CC pin orientation.
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*
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* Return: ORIENTATION_CC1 or ORIENTATION_CC2 if attached,
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* otherwise ORIENTATION_NONE if not attached
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*/
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enum plug_orientation usbpd_get_plug_orientation(struct usbpd *pd);
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#else
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static inline struct usbpd *devm_usbpd_get_by_phandle(struct device *dev,
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const char *phandle)
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{
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return ERR_PTR(-ENODEV);
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}
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static inline int usbpd_register_svid(struct usbpd *pd,
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struct usbpd_svid_handler *hdlr)
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{
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return -EINVAL;
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}
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static inline void usbpd_unregister_svid(struct usbpd *pd,
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struct usbpd_svid_handler *hdlr)
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{
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}
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static inline int usbpd_send_vdm(struct usbpd *pd, u32 vdm_hdr, const u32 *vdos,
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int num_vdos)
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{
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return -EINVAL;
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}
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static inline int usbpd_send_svdm(struct usbpd *pd, u16 svid, u8 cmd,
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enum usbpd_svdm_cmd_type cmd_type, int obj_pos,
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const u32 *vdos, int num_vdos)
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{
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return -EINVAL;
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}
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static inline enum plug_orientation usbpd_get_plug_orientation(struct usbpd *pd)
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{
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return ORIENTATION_NONE;
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}
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#endif /* IS_ENABLED(CONFIG_USB_PD_POLICY) */
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/*
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* Additional helpers for Enter/Exit Mode commands
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*/
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static inline int usbpd_enter_mode(struct usbpd *pd, u16 svid, int mode,
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const u32 *vdo)
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{
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return usbpd_send_svdm(pd, svid, USBPD_SVDM_ENTER_MODE,
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SVDM_CMD_TYPE_INITIATOR, mode, vdo, vdo ? 1 : 0);
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}
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static inline int usbpd_exit_mode(struct usbpd *pd, u16 svid, int mode,
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const u32 *vdo)
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{
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return usbpd_send_svdm(pd, svid, USBPD_SVDM_EXIT_MODE,
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SVDM_CMD_TYPE_INITIATOR, mode, vdo, vdo ? 1 : 0);
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}
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#endif /* __LINUX_USB_USBPD_H */
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