/*
 * ./kernel_modules/pse/pse-port.h
 *
 * This file provides the struct definitions for a PSE port

 * Author: Cradlepoint Technology, Inc.  <source@cradlepoint.com>
 *		Kyle Swenson <kswenson@cradlepoint.com>
 *
 * Copyright 2017 Cradlepoint Technology, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */
#ifndef __PSE_PORT_H__
#define __PSE_PORT_H__

/*
 *sys/class/pse/portX/ :
 * class:
	R: Last classification result
	W: enable classification
 * config:
	R: Dump port config
 * detect:
	R: Last detection Result
	W: Enable detection
 * pd_current:
	R: Current measurement at the port
 * pd_voltage:
	R: Voltage measurement at the port
 * power:
	W: "on" to power on a port
	R: whether or not the port is powered
 * reset:
	W: Reset the port
 * config:
 *
 */

#define PSE_PORT_NAME_SIZE 8
#define PSE_PORT_PREFIX "port"

/**
 * struct pse_port_config - a configuration block for PSE ports


 * @port_type: PSE_PORT_TYPE1 to configure af/at ( 15.4 W Max per port)
 *			   PSE_PORT_TYPE2 to configure at+ (30 W Max per Port),
 *			   PSE_PORT_TYPE3 for bt (Up to Class 6, 60W Max per port)
 *			   PSE_PORT_TYPE4 for bt (Up to Class 8, 90W Max per port)

 * @managed: True if we are managing/configuring the port
 * @enabled: False to shutdown the port
 * @disconnect_event: Event on PD disconnection
 * @detect_enable: Enable detection on the port
 * @classify_enable: Enable classification  on the port
 * @current_limit: Set the port current limit (in mA), above which the port will be shut down.
 */
struct pse_port_config {
	uint8_t enabled;
	uint8_t managed;
	uint8_t port_type;
	uint8_t disconnect_event;
	uint8_t detect_enable;
	uint8_t classify_enable;
	uint8_t legacy_enable;
	uint8_t ping_pong_enable;
	uint32_t current_limit;
};
enum{
	PSE_PORT_TYPE1,
	PSE_PORT_TYPE2,
	PSE_PORT_TYPE3,
	PSE_PORT_TYPE4,
};

enum {
	DETECT_NO_DEVICE = 0,
	DETECT_NORMAL_DEVICE, /* Short */
	DETECT_LEGACY_DEVICE, /* High cap devices */
	DETECT_POWERED_DEVICE,/* Signature resistance good */
	DETECT_ERROR, /* Port Voltage too high, open, rsig too low/rsig too high */
	PSE_NUM_DETECT_EVENTS /*This needs to be the last in this enum for bounds checking */
};

enum {
	CLASS_UNKNOWN = 0,
	CLASS_1,
	CLASS_2,
	CLASS_3,
	CLASS_4,
	CLASS_5, /* Class 5, 4 Pair single signature */
	CLASS_6, /* Class 6, 4 Pair Single signature */
	CLASS_7, /* Class 7, 4 Pair Single signature */
	CLASS_8, /* Class 8, 4 Pair Single signature */
	CLASS_1D, /* Class 1, 4 Pair Dual signature (Class 1 allocation, independent per-pair) */
	CLASS_2D, /* Class 2, 4 Pair Dual signature (Class 2 allocation, independent per-pair) */
	CLASS_3D,
	CLASS_4D,
	CLASS_5D, /* Class 5, 4 Pair Dual Signature  (90W same as class 8, 4 Pair Single )*/
	CLASS_INVALID,
	PSE_NUM_CLASS_EVENTS/*This needs to be the last in this enum for bounds checking */
};
/**
 * struct pse_port_ops - The set of operations of a PSE port.  The PSE class will use these methods (if defined) to realize a PSE port
 * @pd_voltage: Returns the voltage (in Volts) as measured at the port,
 *		negative on error. Used only for status update, not power budgeting.
 * @pd_current: Returns the current (in mA) as measured at the port, negative
 *		on error. Used only for status updates, not power budgeting
 * @last_detection:Returns the result of the last detection cycle on the port,
 *		negative on error.
 * @last_classification: Returns the result of the last classification cycle on
 *		the port, negative on error
 * @apply_power: Power a port.  Returns "enable" on success, negative on error.
 * @pd_powered:  Return >0 if the port is currently powering a device; 0 if the
 *		port is NOT currently powering a device, and <0 on error
 * @set_current_limit:	Sets the current limit, in mA.  If the port current
 *		exceeds this limit, the driver is responsible for shutting down the port
 *		(reset) and then send a PORT_DOWN event to the pse class
 * @get_current_limit: Returns the port's currently configured current limit.
 * @reset:	Reset a port.  If it was powering a device, unpower that device.
 *		Set the port to be in the same state as if it were just initialized
 * @enable_detection:	Allow a port to run (continuous) detection cycles
 * @enable_classification:	Allow a port to run classification cycles.
 * @configure: Configure port parameters.
 * @reset:	Reset the pse port
 */
struct pse_port_ops {
	int (*pd_voltage)(struct device *);
	int (*pd_current)(struct device *);
	int (*last_classification)(struct device *);
	int (*last_detection)(struct device *);
	int (*update_detection)(struct device *);
	int (*update_classification)(struct device *);
	int (*apply_power)(struct device *, unsigned enable);
	int (*pd_powered)(struct device *);
	int (*configure)(struct device *, struct pse_port_config *);
	int (*status)(struct device *);
	int (*get_config)(struct device *, struct pse_port_config *);
	int (*reset)(struct device *);
	int (*set_power_limit)(struct device *, int current_limit);
	int (*get_power_limit)(struct device *);
	int (*enable_detect)(struct device *, int enable);
	int (*enable_classify)(struct device *, int enable);
};
#define PORT_EVENT_DISCONNECT	0x01
#define PORT_EVENT_DETECTED		0x02
#define PORT_EVENT_CLASSIFIED	0x04

struct pse_port_device;
struct power_channel;

struct power_channel {
	uint8_t detect_result; /*One of DETECT values (below) */
	uint8_t class_result;
	uint8_t connection_type;
	uint8_t autoclass_result;
	uint8_t id;  /* The ID of this channel, range [0,3]. */
	struct pse_port_device *port; /* The port (Power Interface) that "contains" this power_channel */
	const struct pse_channel_ops *ops;
};
enum {
	CONNECTION_TYPE_UNKNOWN = 0,
	CONNECTION_TYPE_SINGLE,
	CONNECTION_TYPE_DUAL,
	CONNECTION_TYPE_INVALID
};

static inline void power_channel_reset(struct power_channel *c)
{
	c->detect_result = DETECT_NO_DEVICE;
	c->class_result = CLASS_INVALID;
	c->connection_type = CONNECTION_TYPE_INVALID;
	c->autoclass_result = 0;
}

/* Represent a "pse_port"
 * Register this with the pse class
 */
struct pse_port_device {
	struct device dev;
	struct module *owner;
	int ref_count;
	int id; /* This ID is the X in /sys/class/pse/portX */
	uint8_t priority; /* Priority of the port, owned by the PSE Class */
	uint32_t power_allocation; /* Maximum power allocated for this port, owned by the PSE class */
	uint32_t power_request; /* Power requested by this port */
	uint32_t enabled; /* Should this port provide power? */
	struct power_channel *channel[2];

	/* dual_signature devices have a maximum classification of 5 on each pair-set,
	 * and each channel is powered (or not) independently
	 */
	uint8_t dual_signature;

	/* This is the index of the port on the specific chip  */
	uint8_t port_id;
	uint8_t last_detect_result;
	struct workqueue_struct *wq;
	struct work_struct request_power;
	struct work_struct disconnect;
	uint8_t last_class_result;
	const struct pse_port_ops *ops;
	struct mutex lock; /* Intended to protect _this port's_ members */
	char name[PSE_PORT_NAME_SIZE];
	struct device *next_lp; /* The next lowest  priority port */
	struct device *next_hp; /* The next highest priority port */
};

static inline void pse_port_reset(struct pse_port_device *p)
{
	power_channel_reset(p->channel[0]);
	power_channel_reset(p->channel[1]);
	p->last_class_result = CLASS_INVALID;
	p->last_detect_result = DETECT_NO_DEVICE;
	p->dual_signature = 0;
	p->power_allocation = 0;
}

#define to_pse_port_device(d) container_of(d, struct pse_port_device, dev)
#define to_ppd(dev)  to_pse_port_device(dev)


static inline void pse_port_set_clientdata(struct pse_port_device *port, void *userdata)
{
	dev_set_drvdata(&port->dev, userdata);
}
static inline void *pse_port_get_clientdata(struct pse_port_device *port)
{
	return dev_get_drvdata(&port->dev);
}


struct pse_port_device *pse_port_device_create(struct device *dev, const char *name, const struct pse_port_ops *ops, struct module *owner);
struct pse_port_device *pse_port_device_register(struct pse_port_device *pse_port);
void pse_port_device_unregister(struct pse_port_device *);

extern char *pse_detect_strings[];
extern char *pse_class_strings[];
#endif