OpenCellular/include/usb_pd_tcpm.h

/* Copyright 2015 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

/* USB Power delivery port management */

#ifndef __CROS_EC_USB_PD_TCPM_H
#define __CROS_EC_USB_PD_TCPM_H

/* Default retry count for transmitting */
#define PD_RETRY_COUNT 3

/* Time to wait for TCPC to complete transmit */
#define PD_T_TCPC_TX_TIMEOUT  (100*MSEC)

enum tcpc_cc_voltage_status {
	TYPEC_CC_VOLT_OPEN = 0,
	TYPEC_CC_VOLT_RA = 1,
	TYPEC_CC_VOLT_RD = 2,
	TYPEC_CC_VOLT_SNK_DEF = 5,
	TYPEC_CC_VOLT_SNK_1_5 = 6,
	TYPEC_CC_VOLT_SNK_3_0 = 7,
};

enum tcpc_cc_pull {
	TYPEC_CC_RA = 0,
	TYPEC_CC_RP = 1,
	TYPEC_CC_RD = 2,
	TYPEC_CC_OPEN = 3,
};

enum tcpm_transmit_type {
	TCPC_TX_SOP = 0,
	TCPC_TX_SOP_PRIME = 1,
	TCPC_TX_SOP_PRIME_PRIME = 2,
	TCPC_TX_SOP_DEBUG_PRIME = 3,
	TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
	TCPC_TX_HARD_RESET = 5,
	TCPC_TX_CABLE_RESET = 6,
	TCPC_TX_BIST_MODE_2 = 7
};

enum tcpc_transmit_complete {
	TCPC_TX_COMPLETE_SUCCESS =   0,
	TCPC_TX_COMPLETE_DISCARDED = 1,
	TCPC_TX_COMPLETE_FAILED =    2,
};

struct tcpc_config_t {
	int i2c_host_port;
	int i2c_slave_addr;
	/*
	 * TODO: Consider adding driver struct / function pointers to support
	 * different TCPM drivers on the same board.
	 */
};

/**
 * Returns the PD_STATUS_TCPC_ALERT_* mask corresponding to the TCPC ports
 * that are currently asserting ALERT.
 *
 * @return     PD_STATUS_TCPC_ALERT_* mask.
 */
uint16_t tcpc_get_alert_status(void);

/**
 * Initialize TCPM driver and wait for TCPC readiness.
 *
 * @param port Type-C port number
 *
 * @return EC_SUCCESS or error
 */
int tcpm_init(int port);

/**
 * Initialize TCPC.
 *
 * @param port Type-C port number
 */
void tcpc_init(int port);

/**
 * TCPC is asserting alert
 *
 * @param port Type-C port number
 */
void tcpc_alert(int port);
void tcpc_alert_clear(int port);

/**
 * Run TCPC task once. This checks for incoming messages, processes
 * any outgoing messages, and reads CC lines.
 *
 * @param port Type-C port number
 * @param evt Event type that woke up this task
 */
int tcpc_run(int port, int evt);


/**
 * Read TCPC alert status
 *
 * @param port Type-C port number
 * @param alert Pointer to location to store alert status

 * @return EC_SUCCESS or error
 */
int tcpm_alert_status(int port, int *alert);

/**
 * Write TCPC Alert Mask register
 *
 * @param port Type-C port number
 * @param mask bits to be set in Alert Mask register

 * @return EC_SUCCESS or error
 */
int tcpm_alert_mask_set(int port, uint16_t mask);

/**
 * Read the CC line status.
 *
 * @param port Type-C port number
 * @param cc1 pointer to CC status for CC1
 * @param cc2 pointer to CC status for CC2
 *
 * @return EC_SUCCESS or error
 */
int tcpm_get_cc(int port, int *cc1, int *cc2);

/**
 * Read VBUS
 *
 * @param port Type-C port number
 *
 * @return 0 => VBUS not detected, 1 => VBUS detected
 */
int tcpm_get_vbus_level(int port);

/**
 * Set the CC pull resistor. This sets our role as either source or sink.
 *
 * @param port Type-C port number
 * @param pull One of enum tcpc_cc_pull
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_cc(int port, int pull);

/**
 * Set polarity
 *
 * @param port Type-C port number
 * @param polarity 0=> transmit on CC1, 1=> transmit on CC2
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_polarity(int port, int polarity);

/**
 * Set TCPC Power Status Mask
 *
 * @param port Type-C port number
 * @param mask => new mask value
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_power_status_mask(int port, uint8_t mask);

/**
 * Set Vconn.
 *
 * @param port Type-C port number
 * @param polarity Polarity of the CC line to read
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_vconn(int port, int enable);

/**
 * Set PD message header to use for goodCRC
 *
 * @param port Type-C port number
 * @param power_role Power role to use in header
 * @param data_role Data role to use in header
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_msg_header(int port, int power_role, int data_role);

/**
 * Set RX enable flag
 *
 * @param port Type-C port number
 * @enable true for enable, false for disable
 *
 * @return EC_SUCCESS or error
 */
int tcpm_set_rx_enable(int port, int enable);

/**
 * Read last received PD message.
 *
 * @param port Type-C port number
 * @param payload Pointer to location to copy payload of message
 * @param header of message
 *
 * @return EC_SUCCESS or error
 */
int tcpm_get_message(int port, uint32_t *payload, int *head);

/**
 * Transmit PD message
 *
 * @param port Type-C port number
 * @param type Transmit type
 * @param header Packet header
 * @param cnt Number of bytes in payload
 * @param data Payload
 *
 * @return EC_SUCCESS or error
 */
int tcpm_transmit(int port, enum tcpm_transmit_type type, uint16_t header,
		   const uint32_t *data);

#endif /* __CROS_EC_USB_PD_TCPM_H */