/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __DRIVER_USB_TYPEC_UCSI_H
#define __DRIVER_USB_TYPEC_UCSI_H

#include <linux/bitops.h>
#include <linux/bitmap.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/power_supply.h>
#include <linux/types.h>
#include <linux/usb/typec.h>
#include <linux/usb/pd.h>
#include <linux/usb/role.h>
#include <linux/unaligned.h>

/* -------------------------------------------------------------------------- */

struct ucsi;
struct ucsi_altmode;
struct ucsi_connector;
struct dentry;

/* UCSI offsets (Bytes) */
#define UCSI_VERSION			0
#define UCSI_CCI			4
#define UCSI_CONTROL			8
#define UCSI_MESSAGE_IN			16
#define UCSI_MESSAGE_OUT		32
#define UCSIv2_MESSAGE_OUT		272

/* UCSI versions */
#define UCSI_VERSION_1_0	0x0100
#define UCSI_VERSION_1_1	0x0110
#define UCSI_VERSION_1_2	0x0120
#define UCSI_VERSION_2_0	0x0200
#define UCSI_VERSION_2_1	0x0210
#define UCSI_VERSION_3_0	0x0300

#define UCSI_BCD_GET_MAJOR(_v_)		(((_v_) >> 8) & 0xFF)
#define UCSI_BCD_GET_MINOR(_v_)		(((_v_) >> 4) & 0x0F)
#define UCSI_BCD_GET_SUBMINOR(_v_)	((_v_) & 0x0F)

/*
 * Per USB PD 3.2, Section 6.2.1.1.5, the spec revision is represented by 2 bits
 * 0b00 = 1.0, 0b01 = 2.0, 0b10 = 3.0, 0b11 = Reserved, Shall NOT be used.
 */
#define UCSI_SPEC_REVISION_TO_BCD(_v_)  (((_v_) + 1) << 8)

/* Command Status and Connector Change Indication (CCI) bits */
#define UCSI_CCI_CONNECTOR(_c_)		(((_c_) & GENMASK(7, 1)) >> 1)
#define UCSI_CCI_LENGTH(_c_)		(((_c_) & GENMASK(15, 8)) >> 8)
#define UCSI_SET_CCI_LENGTH(_c_)	((_c_) << 8)
#define UCSI_CCI_NOT_SUPPORTED		BIT(25)
#define UCSI_CCI_CANCEL_COMPLETE	BIT(26)
#define UCSI_CCI_RESET_COMPLETE		BIT(27)
#define UCSI_CCI_BUSY			BIT(28)
#define UCSI_CCI_ACK_COMPLETE		BIT(29)
#define UCSI_CCI_ERROR			BIT(30)
#define UCSI_CCI_COMMAND_COMPLETE	BIT(31)

/**
 * struct ucsi_operations - UCSI I/O operations
 * @read_version: Read implemented UCSI version
 * @read_cci: Read CCI register
 * @poll_cci: Read CCI register while polling with notifications disabled
 * @read_message_in: Read message data from UCSI
 * @sync_control: Blocking control operation
 * @async_control: Non-blocking control operation
 * @update_altmodes: Squashes duplicate DP altmodes
 * @update_connector: Update connector capabilities before registering
 * @connector_status: Updates connector status, called holding connector lock
 *
 * Read and write routines for UCSI interface. @sync_write must wait for the
 * Command Completion Event from the PPM before returning, and @async_write must
 * return immediately after sending the data to the PPM.
 */
struct ucsi_operations {
	int (*read_version)(struct ucsi *ucsi, u16 *version);
	int (*read_cci)(struct ucsi *ucsi, u32 *cci);
	int (*poll_cci)(struct ucsi *ucsi, u32 *cci);
	int (*read_message_in)(struct ucsi *ucsi, void *val, size_t val_len);
	int (*sync_control)(struct ucsi *ucsi, u64 command, u32 *cci,
			    void *data, size_t size);
	int (*async_control)(struct ucsi *ucsi, u64 command);
	bool (*update_altmodes)(struct ucsi *ucsi, u8 recipient,
				struct ucsi_altmode *orig,
				struct ucsi_altmode *updated);
	void (*update_connector)(struct ucsi_connector *con);
	void (*connector_status)(struct ucsi_connector *con);
};

struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops);
void ucsi_destroy(struct ucsi *ucsi);
int ucsi_register(struct ucsi *ucsi);
void ucsi_unregister(struct ucsi *ucsi);
void *ucsi_get_drvdata(struct ucsi *ucsi);
void ucsi_set_drvdata(struct ucsi *ucsi, void *data);
bool ucsi_con_mutex_lock(struct ucsi_connector *con);
void ucsi_con_mutex_unlock(struct ucsi_connector *con);

void ucsi_connector_change(struct ucsi *ucsi, u8 num);

/* -------------------------------------------------------------------------- */

/* Commands */
#define UCSI_PPM_RESET				0x01
#define UCSI_CANCEL				0x02
#define UCSI_CONNECTOR_RESET			0x03
#define UCSI_ACK_CC_CI				0x04
#define UCSI_SET_NOTIFICATION_ENABLE		0x05
#define UCSI_GET_CAPABILITY			0x06
#define UCSI_GET_CAPABILITY_SIZE		128
#define UCSI_GET_CONNECTOR_CAPABILITY		0x07
#define UCSI_GET_CONNECTOR_CAPABILITY_SIZE	32
#define UCSI_SET_CCOM				0x08
#define UCSI_SET_UOR				0x09
#define UCSI_SET_PDM				0x0a
#define UCSI_SET_PDR				0x0b
#define UCSI_GET_ALTERNATE_MODES		0x0c
#define UCSI_GET_CAM_SUPPORTED			0x0d
#define UCSI_GET_CURRENT_CAM			0x0e
#define UCSI_SET_NEW_CAM			0x0f
#define UCSI_GET_PDOS				0x10
#define UCSI_GET_CABLE_PROPERTY			0x11
#define UCSI_GET_CABLE_PROPERTY_SIZE		64
#define UCSI_GET_CONNECTOR_STATUS		0x12
#define UCSI_GET_CONNECTOR_STATUS_SIZE		152
#define UCSI_GET_ERROR_STATUS			0x13
#define UCSI_GET_ATTENTION_VDO			0x16
#define UCSI_GET_PD_MESSAGE			0x15
#define UCSI_GET_CAM_CS			0x18
#define UCSI_SET_SINK_PATH			0x1c
#define UCSI_READ_POWER_LEVEL			0x1e
#define UCSI_SET_USB				0x21
#define UCSI_GET_LPM_PPM_INFO			0x22

#define UCSI_CONNECTOR_NUMBER(_num_)		((u64)(_num_) << 16)
#define UCSI_COMMAND(_cmd_)			((_cmd_) & 0xff)

#define UCSI_GET_ALTMODE_GET_CONNECTOR_NUMBER(_cmd_)	(((_cmd_) >> 24) & GENMASK(6, 0))
#define UCSI_DEFAULT_GET_CONNECTOR_NUMBER(_cmd_)	(((_cmd_) >> 16) & GENMASK(6, 0))

/* CONNECTOR_RESET command bits */
#define UCSI_CONNECTOR_RESET_HARD_VER_1_0	BIT(23) /* Deprecated in v1.1 */
#define UCSI_CONNECTOR_RESET_DATA_VER_2_0	BIT(23) /* Redefined in v2.0 */

/* ACK_CC_CI bits */
#define UCSI_ACK_CONNECTOR_CHANGE		BIT(16)
#define UCSI_ACK_COMMAND_COMPLETE		BIT(17)

/* SET_NOTIFICATION_ENABLE command bits */
#define UCSI_ENABLE_NTFY_CMD_COMPLETE		BIT_ULL(16)
#define UCSI_ENABLE_NTFY_EXT_PWR_SRC_CHANGE	BIT_ULL(17)
#define UCSI_ENABLE_NTFY_PWR_OPMODE_CHANGE	BIT_ULL(18)
#define UCSI_ENABLE_NTFY_ATTENTION		BIT_ULL(19)
#define UCSI_ENABLE_NTFY_LPM_FW_UPDATE_REQ	BIT_ULL(20)
#define UCSI_ENABLE_NTFY_CAP_CHANGE		BIT_ULL(21)
#define UCSI_ENABLE_NTFY_PWR_LEVEL_CHANGE	BIT_ULL(22)
#define UCSI_ENABLE_NTFY_PD_RESET_COMPLETE	BIT_ULL(23)
#define UCSI_ENABLE_NTFY_CAM_CHANGE		BIT_ULL(24)
#define UCSI_ENABLE_NTFY_BAT_STATUS_CHANGE	BIT_ULL(25)
#define UCSI_ENABLE_NTFY_SECURITY_REQ_PARTNER	BIT_ULL(26)
#define UCSI_ENABLE_NTFY_PARTNER_CHANGE		BIT_ULL(27)
#define UCSI_ENABLE_NTFY_PWR_DIR_CHANGE		BIT_ULL(28)
#define UCSI_ENABLE_NTFY_SET_RETIMER_MODE	BIT_ULL(29)
#define UCSI_ENABLE_NTFY_CONNECTOR_CHANGE	BIT_ULL(30)
#define UCSI_ENABLE_NTFY_ERROR			BIT_ULL(31)
#define UCSI_ENABLE_NTFY_SINK_PATH_STS_CHANGE	BIT_ULL(32)
#define UCSI_ENABLE_NTFY_ALL			0xdbe70000

/* SET_UOR command bits */
#define UCSI_SET_UOR_ROLE(_r_)		(((_r_) == TYPEC_HOST ? 1 : 2) << 23)
#define UCSI_SET_UOR_ACCEPT_ROLE_SWAPS		BIT(25)

/* SET_PDF command bits */
#define UCSI_SET_PDR_ROLE(_r_)		(((_r_) == TYPEC_SOURCE ? 1 : 2) << 23)
#define UCSI_SET_PDR_ACCEPT_ROLE_SWAPS		BIT(25)

/* GET_ALTERNATE_MODES command bits */
#define UCSI_ALTMODE_RECIPIENT(_r_)		(((_r_) >> 16) & 0x7)
#define UCSI_GET_ALTMODE_RECIPIENT(_r_)		((u64)(_r_) << 16)
#define   UCSI_RECIPIENT_CON			0
#define   UCSI_RECIPIENT_SOP			1
#define   UCSI_RECIPIENT_SOP_P			2
#define   UCSI_RECIPIENT_SOP_PP			3
#define UCSI_GET_ALTMODE_CONNECTOR_NUMBER(_r_)	((u64)(_r_) << 24)
#define UCSI_ALTMODE_OFFSET(_r_)		(((_r_) >> 32) & 0xff)
#define UCSI_GET_ALTMODE_OFFSET(_r_)		((u64)(_r_) << 32)
#define UCSI_GET_ALTMODE_NUM_ALTMODES(_r_)	((u64)(_r_) << 40)

/* GET_PDOS command bits */
#define UCSI_GET_PDOS_PARTNER_PDO(_r_)		((u64)(_r_) << 23)
#define UCSI_GET_PDOS_PDO_OFFSET(_r_)		((u64)(_r_) << 24)
#define UCSI_GET_PDOS_NUM_PDOS(_r_)		((u64)(_r_) << 32)
#define UCSI_MAX_PDOS				(4)
#define UCSI_GET_PDOS_SRC_PDOS			((u64)1 << 34)

/* GET_PD_MESSAGE command bits */
#define UCSI_GET_PD_MESSAGE_RECIPIENT(_r_)	((u64)(_r_) << 23)
#define UCSI_GET_PD_MESSAGE_OFFSET(_r_)		((u64)(_r_) << 26)
#define UCSI_GET_PD_MESSAGE_BYTES(_r_)		((u64)(_r_) << 34)
#define UCSI_GET_PD_MESSAGE_TYPE(_r_)		((u64)(_r_) << 42)
#define   UCSI_GET_PD_MESSAGE_TYPE_SNK_CAP_EXT	0
#define   UCSI_GET_PD_MESSAGE_TYPE_SRC_CAP_EXT	1
#define   UCSI_GET_PD_MESSAGE_TYPE_BAT_CAP	2
#define   UCSI_GET_PD_MESSAGE_TYPE_BAT_STAT	3
#define   UCSI_GET_PD_MESSAGE_TYPE_IDENTITY	4
#define   UCSI_GET_PD_MESSAGE_TYPE_REVISION	5

/* -------------------------------------------------------------------------- */

/* Error information returned by PPM in response to GET_ERROR_STATUS command. */
#define UCSI_ERROR_UNREGONIZED_CMD		BIT(0)
#define UCSI_ERROR_INVALID_CON_NUM		BIT(1)
#define UCSI_ERROR_INVALID_CMD_ARGUMENT		BIT(2)
#define UCSI_ERROR_INCOMPATIBLE_PARTNER		BIT(3)
#define UCSI_ERROR_CC_COMMUNICATION_ERR		BIT(4)
#define UCSI_ERROR_DEAD_BATTERY			BIT(5)
#define UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL	BIT(6)
#define UCSI_ERROR_OVERCURRENT			BIT(7)
#define UCSI_ERROR_UNDEFINED			BIT(8)
#define UCSI_ERROR_PARTNER_REJECTED_SWAP	BIT(9)
#define UCSI_ERROR_HARD_RESET			BIT(10)
#define UCSI_ERROR_PPM_POLICY_CONFLICT		BIT(11)
#define UCSI_ERROR_SWAP_REJECTED		BIT(12)
#define UCSI_ERROR_REVERSE_CURRENT_PROTECTION	BIT(13)
#define UCSI_ERROR_SET_SINK_PATH_REJECTED	BIT(14)

#define UCSI_SET_NEW_CAM_ENTER(x)		(((x) >> 23) & 0x1)
#define UCSI_SET_NEW_CAM_GET_AM(x)		(((x) >> 24) & 0xff)
#define UCSI_SET_NEW_CAM_AM_MASK		(0xff << 24)
#define UCSI_SET_NEW_CAM_SET_AM(x)		(((x) & 0xff) << 24)
#define UCSI_CMD_CONNECTOR_MASK			(0x7)

/* Data structure filled by PPM in response to GET_CAPABILITY command. */
struct ucsi_capability {
	u32 attributes;
#define UCSI_CAP_ATTR_DISABLE_STATE		BIT(0)
#define UCSI_CAP_ATTR_BATTERY_CHARGING		BIT(1)
#define UCSI_CAP_ATTR_USB_PD			BIT(2)
#define UCSI_CAP_ATTR_TYPEC_CURRENT		BIT(6)
#define UCSI_CAP_ATTR_POWER_AC_SUPPLY		BIT(8)
#define UCSI_CAP_ATTR_POWER_OTHER		BIT(10)
#define UCSI_CAP_ATTR_POWER_VBUS		BIT(14)
	u8 num_connectors;
	u16 features;
#define UCSI_CAP_SET_UOM			BIT(0)
#define UCSI_CAP_SET_PDM			BIT(1)
#define UCSI_CAP_ALT_MODE_DETAILS		BIT(2)
#define UCSI_CAP_ALT_MODE_OVERRIDE		BIT(3)
#define UCSI_CAP_PDO_DETAILS			BIT(4)
#define UCSI_CAP_CABLE_DETAILS			BIT(5)
#define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS	BIT(6)
#define UCSI_CAP_PD_RESET			BIT(7)
#define UCSI_CAP_GET_PD_MESSAGE			BIT(8)
#define UCSI_CAP_GET_ATTENTION_VDO		BIT(9)
#define UCSI_CAP_FW_UPDATE_REQUEST		BIT(10)
#define UCSI_CAP_NEGOTIATED_PWR_LEVEL_CHANGE	BIT(11)
#define UCSI_CAP_SECURITY_REQUEST		BIT(12)
#define UCSI_CAP_SET_RETIMER_MODE		BIT(13)
#define UCSI_CAP_CHUNKING_SUPPORT		BIT(14)
	u8 reserved_1;
	u8 num_alt_modes;
	u8 reserved_2;
	u16 bc_version;
	u16 pd_version;
	u16 typec_version;
} __packed;

struct ucsi_altmode {
	u16 svid;
	u32 mid;
} __packed;

/* Data structure filled by PPM in response to GET_CABLE_PROPERTY command. */
struct ucsi_cable_property {
	u16 speed_supported;
	u8 current_capability;
	u8 flags;
#define UCSI_CABLE_PROP_FLAG_VBUS_IN_CABLE	BIT(0)
#define UCSI_CABLE_PROP_FLAG_ACTIVE_CABLE	BIT(1)
#define UCSI_CABLE_PROP_FLAG_DIRECTIONALITY	BIT(2)
#define UCSI_CABLE_PROP_FLAG_PLUG_TYPE(_f_)	(((_f_) & GENMASK(4, 3)) >> 3)
#define   UCSI_CABLE_PROPERTY_PLUG_TYPE_A	0
#define   UCSI_CABLE_PROPERTY_PLUG_TYPE_B	1
#define   UCSI_CABLE_PROPERTY_PLUG_TYPE_C	2
#define   UCSI_CABLE_PROPERTY_PLUG_OTHER	3
#define UCSI_CABLE_PROP_FLAG_MODE_SUPPORT	BIT(5)
#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_)	(((_f_) & GENMASK(7, 6)) >> 6)
#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(_f_) \
	UCSI_SPEC_REVISION_TO_BCD(UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_))
	u8 latency;
} __packed;

/* Get Connector Capability Fields. */
#define UCSI_CONCAP_OPMODE			UCSI_DECLARE_BITFIELD(0, 0, 8)
#define   UCSI_CONCAP_OPMODE_DFP		UCSI_DECLARE_BITFIELD(0, 0, 1)
#define   UCSI_CONCAP_OPMODE_UFP		UCSI_DECLARE_BITFIELD(0, 1, 1)
#define   UCSI_CONCAP_OPMODE_DRP		UCSI_DECLARE_BITFIELD(0, 2, 1)
#define   UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY	UCSI_DECLARE_BITFIELD(0, 3, 1)
#define   UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY	UCSI_DECLARE_BITFIELD(0, 4, 1)
#define   UCSI_CONCAP_OPMODE_USB2		UCSI_DECLARE_BITFIELD(0, 5, 1)
#define   UCSI_CONCAP_OPMODE_USB3		UCSI_DECLARE_BITFIELD(0, 6, 1)
#define   UCSI_CONCAP_OPMODE_ALT_MODE		UCSI_DECLARE_BITFIELD(0, 7, 1)
#define UCSI_CONCAP_PROVIDER			UCSI_DECLARE_BITFIELD(0, 8, 1)
#define UCSI_CONCAP_CONSUMER			UCSI_DECLARE_BITFIELD(0, 9, 1)
#define UCSI_CONCAP_SWAP_TO_DFP_V1_1		UCSI_DECLARE_BITFIELD_V1_1(10, 1)
#define UCSI_CONCAP_SWAP_TO_UFP_V1_1		UCSI_DECLARE_BITFIELD_V1_1(11, 1)
#define UCSI_CONCAP_SWAP_TO_SRC_V1_1		UCSI_DECLARE_BITFIELD_V1_1(12, 1)
#define UCSI_CONCAP_SWAP_TO_SNK_V1_1		UCSI_DECLARE_BITFIELD_V1_1(13, 1)
#define UCSI_CONCAP_EXT_OPMODE_V2_0		UCSI_DECLARE_BITFIELD_V2_0(14, 8)
#define   UCSI_CONCAP_EXT_OPMODE_USB4_GEN2_V2_0	UCSI_DECLARE_BITFIELD_V2_0(14, 1)
#define   UCSI_CONCAP_EXT_OPMODE_EPR_SRC_V2_0	UCSI_DECLARE_BITFIELD_V2_0(15, 1)
#define   UCSI_CONCAP_EXT_OPMODE_EPR_SINK_V2_0	UCSI_DECLARE_BITFIELD_V2_0(16, 1)
#define   UCSI_CONCAP_EXT_OPMODE_USB4_GEN3_V2_0	UCSI_DECLARE_BITFIELD_V2_0(17, 1)
#define   UCSI_CONCAP_EXT_OPMODE_USB4_GEN4_V2_0	UCSI_DECLARE_BITFIELD_V2_0(18, 1)
#define UCSI_CONCAP_MISC_V2_0			UCSI_DECLARE_BITFIELD_V2_0(22, 4)
#define   UCSI_CONCAP_MISC_FW_UPDATE_V2_0	UCSI_DECLARE_BITFIELD_V2_0(22, 1)
#define   UCSI_CONCAP_MISC_SECURITY_V2_0	UCSI_DECLARE_BITFIELD_V2_0(23, 1)
#define UCSI_CONCAP_REV_CURR_PROT_SUPPORT_V2_0	UCSI_DECLARE_BITFIELD_V2_0(26, 1)
#define UCSI_CONCAP_PARTNER_PD_REVISION_V2_1	UCSI_DECLARE_BITFIELD_V2_1(27, 2)

/* Helpers for USB capability checks. */
#define UCSI_CONCAP_USB2_SUPPORT(_con_) UCSI_CONCAP((_con_), OPMODE_USB2)
#define UCSI_CONCAP_USB3_SUPPORT(_con_) UCSI_CONCAP((_con_), OPMODE_USB3)
#define UCSI_CONCAP_USB4_SUPPORT(_con_)					\
	((_con_)->ucsi->version >= UCSI_VERSION_2_0 &&			\
	 (UCSI_CONCAP((_con_), EXT_OPMODE_USB4_GEN2_V2_0) |		\
	  UCSI_CONCAP((_con_), EXT_OPMODE_USB4_GEN3_V2_0) |		\
	  UCSI_CONCAP((_con_), EXT_OPMODE_USB4_GEN4_V2_0)))

/* Get Connector Status Fields. */
#define UCSI_CONSTAT_CHANGE			UCSI_DECLARE_BITFIELD(0, 0, 16)
#define UCSI_CONSTAT_PWR_OPMODE			UCSI_DECLARE_BITFIELD(0, 16, 3)
#define   UCSI_CONSTAT_PWR_OPMODE_NONE		0
#define   UCSI_CONSTAT_PWR_OPMODE_DEFAULT	1
#define   UCSI_CONSTAT_PWR_OPMODE_BC		2
#define   UCSI_CONSTAT_PWR_OPMODE_PD		3
#define   UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5	4
#define   UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0	5
#define UCSI_CONSTAT_CONNECTED			UCSI_DECLARE_BITFIELD(0, 19, 1)
#define UCSI_CONSTAT_PWR_DIR			UCSI_DECLARE_BITFIELD(0, 20, 1)
#define UCSI_CONSTAT_PARTNER_FLAGS		UCSI_DECLARE_BITFIELD(0, 21, 8)
#define   UCSI_CONSTAT_PARTNER_FLAG_USB		UCSI_DECLARE_BITFIELD(0, 21, 1)
#define   UCSI_CONSTAT_PARTNER_FLAG_ALT_MODE	UCSI_DECLARE_BITFIELD(0, 22, 1)
#define   UCSI_CONSTAT_PARTNER_FLAG_USB4_GEN3	UCSI_DECLARE_BITFIELD(0, 23, 1)
#define   UCSI_CONSTAT_PARTNER_FLAG_USB4_GEN4	UCSI_DECLARE_BITFIELD(0, 24, 1)
#define UCSI_CONSTAT_PARTNER_TYPE		UCSI_DECLARE_BITFIELD(0, 29, 3)
#define   UCSI_CONSTAT_PARTNER_TYPE_DFP		1
#define   UCSI_CONSTAT_PARTNER_TYPE_UFP		2
#define   UCSI_CONSTAT_PARTNER_TYPE_CABLE	3   /* Powered Cable */
#define   UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP 4 /* Powered Cable */
#define   UCSI_CONSTAT_PARTNER_TYPE_DEBUG	5
#define   UCSI_CONSTAT_PARTNER_TYPE_AUDIO	6
#define UCSI_CONSTAT_RDO			UCSI_DECLARE_BITFIELD(0, 32, 32)
#define UCSI_CONSTAT_BC_STATUS			UCSI_DECLARE_BITFIELD(0, 64, 2)
#define   UCSI_CONSTAT_BC_NOT_CHARGING		0
#define   UCSI_CONSTAT_BC_NOMINAL_CHARGING	1
#define   UCSI_CONSTAT_BC_SLOW_CHARGING		2
#define   UCSI_CONSTAT_BC_TRICKLE_CHARGING	3
#define UCSI_CONSTAT_PD_VERSION_V1_2		UCSI_DECLARE_BITFIELD_V1_2(70, 16)
#define UCSI_CONSTAT_PWR_READING_READY_V2_1	UCSI_DECLARE_BITFIELD_V2_1(89, 1)
#define UCSI_CONSTAT_CURRENT_SCALE_V2_1		UCSI_DECLARE_BITFIELD_V2_1(90, 3)
#define UCSI_CONSTAT_PEAK_CURRENT_V2_1		UCSI_DECLARE_BITFIELD_V2_1(93, 16)
#define UCSI_CONSTAT_AVG_CURRENT_V2_1		UCSI_DECLARE_BITFIELD_V2_1(109, 16)
#define UCSI_CONSTAT_VOLTAGE_SCALE_V2_1		UCSI_DECLARE_BITFIELD_V2_1(125, 4)
#define UCSI_CONSTAT_VBUS_VOLTAGE_V2_1		UCSI_DECLARE_BITFIELD_V2_1(129, 16)
#define UCSI_CONSTAT_CURR_SCALE_MULT		5
#define UCSI_CONSTAT_VOLT_SCALE_MULT		5

/* Connector Status Change Bits.  */
#define UCSI_CONSTAT_EXT_SUPPLY_CHANGE		BIT(1)
#define UCSI_CONSTAT_POWER_OPMODE_CHANGE	BIT(2)
#define UCSI_CONSTAT_PDOS_CHANGE		BIT(5)
#define UCSI_CONSTAT_POWER_LEVEL_CHANGE		BIT(6)
#define UCSI_CONSTAT_PD_RESET_COMPLETE		BIT(7)
#define UCSI_CONSTAT_CAM_CHANGE			BIT(8)
#define UCSI_CONSTAT_BC_CHANGE			BIT(9)
#define UCSI_CONSTAT_PARTNER_CHANGE		BIT(11)
#define UCSI_CONSTAT_POWER_DIR_CHANGE		BIT(12)
#define UCSI_CONSTAT_CONNECT_CHANGE		BIT(14)
#define UCSI_CONSTAT_ERROR			BIT(15)

#define UCSI_DECLARE_BITFIELD_V1_1(_offset_, _size_)			\
	  UCSI_DECLARE_BITFIELD(UCSI_VERSION_1_1, (_offset_), (_size_))
#define UCSI_DECLARE_BITFIELD_V1_2(_offset_, _size_)			\
	  UCSI_DECLARE_BITFIELD(UCSI_VERSION_1_2, (_offset_), (_size_))
#define UCSI_DECLARE_BITFIELD_V2_0(_offset_, _size_)			\
	  UCSI_DECLARE_BITFIELD(UCSI_VERSION_2_0, (_offset_), (_size_))
#define UCSI_DECLARE_BITFIELD_V2_1(_offset_, _size_)			\
	  UCSI_DECLARE_BITFIELD(UCSI_VERSION_2_1, (_offset_), (_size_))
#define UCSI_DECLARE_BITFIELD_V3_0(_offset_, _size_)			\
	  UCSI_DECLARE_BITFIELD(UCSI_VERSION_3_0, (_offset_), (_size_))

#define UCSI_DECLARE_BITFIELD(_ver_, _offset_, _size_)			\
(struct ucsi_bitfield) {						\
	.version = _ver_,						\
	.offset = _offset_,						\
	.size = _size_,							\
}

struct ucsi_bitfield {
	const u16 version;
	const u8 offset;
	const u8 size;
};

/**
 * ucsi_bitfield_read - Read a field from UCSI command response
 * @_map_: UCSI command response
 * @_field_: The field offset in the response data structure
 * @_ver_: UCSI version where the field was introduced
 *
 * Reads the fields in the command responses by first checking that the field is
 * valid with the UCSI interface version that is used in the system.
 * @_ver_ is the minimum UCSI version for the @_field_. If the UCSI interface is
 * older than @_ver_, a warning is generated.
 *
 * Caveats:
 * - Removed fields are not checked - @_ver_ is just the minimum UCSI version.
 *
 * Returns the value of @_field_, or 0 when the UCSI interface is older than
 * @_ver_.
 */
#define ucsi_bitfield_read(_map_, _field_, _ver_)			\
({									\
	struct ucsi_bitfield f = (_field_);				\
	WARN((_ver_) < f.version,					\
	"Access to unsupported field at offset 0x%x (need version %04x)", \
	     f.offset, f.version) ? 0 :					\
	bitmap_read((_map_), f.offset, f.size);				\
})

/* Helpers to access cached command responses. */
#define UCSI_CONCAP(_con_, _field_)					\
	ucsi_bitfield_read((_con_)->cap, UCSI_CONCAP_##_field_, (_con_)->ucsi->version)

#define UCSI_CONSTAT(_con_, _field_)					\
	ucsi_bitfield_read((_con_)->status, UCSI_CONSTAT_##_field_, (_con_)->ucsi->version)

/* -------------------------------------------------------------------------- */

struct ucsi_debugfs_entry {
	u64 command;
	struct ucsi_data {
		u64 low;
		u64 high;
	} response;
	int status;
	struct dentry *dentry;
};

struct ucsi {
	u16 version;
	struct device *dev;
	void *driver_data;

	const struct ucsi_operations *ops;

	struct ucsi_capability cap;
	struct ucsi_connector *connector;
	struct ucsi_debugfs_entry *debugfs;

	struct work_struct resume_work;
	struct delayed_work work;
	int work_count;
#define UCSI_ROLE_SWITCH_RETRY_PER_HZ	10
#define UCSI_ROLE_SWITCH_INTERVAL	(HZ / UCSI_ROLE_SWITCH_RETRY_PER_HZ)
#define UCSI_ROLE_SWITCH_WAIT_COUNT	(10 * UCSI_ROLE_SWITCH_RETRY_PER_HZ)

	/* PPM Communication lock */
	struct mutex ppm_lock;

	/* The latest "Notification Enable" bits (SET_NOTIFICATION_ENABLE) */
	u64 ntfy;

	/* PPM communication flags */
	unsigned long flags;
#define EVENT_PENDING	0
#define COMMAND_PENDING	1
#define ACK_PENDING	2
	struct completion complete;

	unsigned long quirks;
#define UCSI_NO_PARTNER_PDOS	BIT(0)	/* Don't read partner's PDOs */
#define UCSI_DELAY_DEVICE_PDOS	BIT(1)	/* Reading PDOs fails until the parter is in PD mode */
};

#define UCSI_MAX_DATA_LENGTH(u) (((u)->version < UCSI_VERSION_2_0) ? 0x10 : 0xff)

#define UCSI_MAX_SVID		5
#define UCSI_MAX_ALTMODES	(UCSI_MAX_SVID * 6)

#define UCSI_TYPEC_VSAFE5V		5000
#define UCSI_TYPEC_DEFAULT_CURRENT	 100
#define UCSI_TYPEC_1_5_CURRENT		1500
#define UCSI_TYPEC_3_0_CURRENT		3000

struct ucsi_connector {
	int num;

	struct ucsi *ucsi;
	struct mutex lock; /* port lock */
	struct work_struct work;
	struct completion complete;
	struct workqueue_struct *wq;
	struct list_head partner_tasks;

	struct typec_port *port;
	struct typec_partner *partner;
	struct typec_cable *cable;
	struct typec_plug *plug;

	struct typec_altmode *port_altmode[UCSI_MAX_ALTMODES];
	struct typec_altmode *partner_altmode[UCSI_MAX_ALTMODES];
	struct typec_altmode *plug_altmode[UCSI_MAX_ALTMODES];

	struct typec_capability typec_cap;

	/* Cached command responses. */
	DECLARE_BITMAP(cap, UCSI_GET_CONNECTOR_CAPABILITY_SIZE);
	DECLARE_BITMAP(status, UCSI_GET_CONNECTOR_STATUS_SIZE);

	struct power_supply *psy;
	struct power_supply_desc psy_desc;
	u32 rdo;
	u32 src_pdos[PDO_MAX_OBJECTS];
	int num_pdos;

	u32 peak_current;
	u32 avg_current;
	u32 vbus_voltage;

	/* USB PD objects */
	struct usb_power_delivery *pd;
	struct usb_power_delivery_capabilities *port_source_caps;
	struct usb_power_delivery_capabilities *port_sink_caps;
	struct usb_power_delivery *partner_pd;
	struct usb_power_delivery_capabilities *partner_source_caps;
	struct usb_power_delivery_capabilities *partner_sink_caps;

	struct usb_role_switch *usb_role_sw;

	/* USB PD identity */
	struct usb_pd_identity partner_identity;
	struct usb_pd_identity cable_identity;
};

int ucsi_send_command(struct ucsi *ucsi, u64 command,
		      void *retval, size_t size);

void ucsi_altmode_update_active(struct ucsi_connector *con);
int ucsi_resume(struct ucsi *ucsi);

void ucsi_notify_common(struct ucsi *ucsi, u32 cci);
int ucsi_sync_control_common(struct ucsi *ucsi, u64 command, u32 *cci,
			     void *data, size_t size);

#if IS_ENABLED(CONFIG_POWER_SUPPLY)
int ucsi_register_port_psy(struct ucsi_connector *con);
void ucsi_unregister_port_psy(struct ucsi_connector *con);
void ucsi_port_psy_changed(struct ucsi_connector *con);
#else
static inline int ucsi_register_port_psy(struct ucsi_connector *con) { return 0; }
static inline void ucsi_unregister_port_psy(struct ucsi_connector *con) { }
static inline void ucsi_port_psy_changed(struct ucsi_connector *con) { }
#endif /* CONFIG_POWER_SUPPLY */

#if IS_ENABLED(CONFIG_TYPEC_DP_ALTMODE)
struct typec_altmode *
ucsi_register_displayport(struct ucsi_connector *con,
			  bool override, int offset,
			  struct typec_altmode_desc *desc);

void ucsi_displayport_remove_partner(struct typec_altmode *adev);

#else
static inline struct typec_altmode *
ucsi_register_displayport(struct ucsi_connector *con,
			  bool override, int offset,
			  struct typec_altmode_desc *desc)
{
	return typec_port_register_altmode(con->port, desc);
}

static inline void
ucsi_displayport_remove_partner(struct typec_altmode *adev) { }
#endif /* CONFIG_TYPEC_DP_ALTMODE */

#ifdef CONFIG_DEBUG_FS
void ucsi_debugfs_init(void);
void ucsi_debugfs_exit(void);
void ucsi_debugfs_register(struct ucsi *ucsi);
void ucsi_debugfs_unregister(struct ucsi *ucsi);
#else
static inline void ucsi_debugfs_init(void) { }
static inline void ucsi_debugfs_exit(void) { }
static inline void ucsi_debugfs_register(struct ucsi *ucsi) { }
static inline void ucsi_debugfs_unregister(struct ucsi *ucsi) { }
#endif /* CONFIG_DEBUG_FS */

/*
 * NVIDIA VirtualLink (svid 0x955) has two altmode. VirtualLink
 * DP mode with vdo=0x1 and NVIDIA test mode with vdo=0x3
 */
#define USB_TYPEC_NVIDIA_VLINK_DP_VDO	0x1
#define USB_TYPEC_NVIDIA_VLINK_DBG_VDO	0x3

#endif /* __DRIVER_USB_TYPEC_UCSI_H */
