/* Copyright (c) 2014 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.
 */

#include "config.h"
#include "case_closed_debug.h"
#include "charge_manager.h"
#include "charger.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "registers.h"
#include "system.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#include "usb_mux.h"
#include "usb_pd.h"

#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ## args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ## args)

#define PDO_FIXED_FLAGS (PDO_FIXED_DUAL_ROLE | PDO_FIXED_DATA_SWAP)

const uint32_t pd_src_pdo[] = {
		PDO_FIXED(5000, 1500, PDO_FIXED_FLAGS),
};
const int pd_src_pdo_cnt = ARRAY_SIZE(pd_src_pdo);

const uint32_t pd_snk_pdo[] = {
		PDO_FIXED(5000, 500, PDO_FIXED_FLAGS),
		PDO_BATT(4500, 14000, 10000),
		PDO_VAR(4500, 14000, 3000),
};
const int pd_snk_pdo_cnt = ARRAY_SIZE(pd_snk_pdo);

void pd_set_input_current_limit(int port, uint32_t max_ma,
				uint32_t supply_voltage)
{
	struct charge_port_info charge;
	charge.current = max_ma;
	charge.voltage = supply_voltage;
	charge_manager_update_charge(CHARGE_SUPPLIER_PD, port, &charge);

	/* notify host of power info change */
	pd_send_host_event(PD_EVENT_POWER_CHANGE);
}

void typec_set_input_current_limit(int port, uint32_t max_ma,
				   uint32_t supply_voltage)
{
	struct charge_port_info charge;
	charge.current = max_ma;
	charge.voltage = supply_voltage;
	charge_manager_update_charge(CHARGE_SUPPLIER_TYPEC, port, &charge);

	/* notify host of power info change */
	pd_send_host_event(PD_EVENT_POWER_CHANGE);
}

int pd_is_valid_input_voltage(int mv)
{
	/* Any voltage less than the max is allowed */
	return 1;
}

int pd_check_requested_voltage(uint32_t rdo)
{
	int max_ma = rdo & 0x3FF;
	int op_ma = (rdo >> 10) & 0x3FF;
	int idx = rdo >> 28;
	uint32_t pdo;
	uint32_t pdo_ma;

	if (!idx || idx > pd_src_pdo_cnt)
		return EC_ERROR_INVAL; /* Invalid index */

	/* check current ... */
	pdo = pd_src_pdo[idx - 1];
	pdo_ma = (pdo & 0x3ff);
	if (op_ma > pdo_ma)
		return EC_ERROR_INVAL; /* too much op current */
	if (max_ma > pdo_ma)
		return EC_ERROR_INVAL; /* too much max current */

	CPRINTF("Requested %d V %d mA (for %d/%d mA)\n",
		((pdo >> 10) & 0x3ff) * 50, (pdo & 0x3ff) * 10,
		((rdo >> 10) & 0x3ff) * 10, (rdo & 0x3ff) * 10);

	return EC_SUCCESS;
}

void pd_transition_voltage(int idx)
{
	/* No-operation: we are always 5V */
}

int pd_set_power_supply_ready(int port)
{
	/* provide VBUS */
	gpio_set_level(GPIO_CHGR_OTG, 1);
	charger_enable_otg_power(1);

	/* notify host of power info change */
	pd_send_host_event(PD_EVENT_POWER_CHANGE);

	return EC_SUCCESS; /* we are ready */
}

void pd_power_supply_reset(int port)
{
	/* Kill VBUS */
	charger_enable_otg_power(0);
	gpio_set_level(GPIO_CHGR_OTG, 0);

	/* notify host of power info change */
	pd_send_host_event(PD_EVENT_POWER_CHANGE);
}

int pd_snk_is_vbus_provided(int port)
{
	return gpio_get_level(GPIO_CHGR_ACOK);
}

int pd_board_checks(void)
{
	return EC_SUCCESS;
}

int pd_check_power_swap(int port)
{
	/* TODO: use battery level to decide to accept/reject power swap */
	/*
	 * Allow power swap as long as we are acting as a dual role device,
	 * otherwise assume our role is fixed (not in S0 or console command
	 * to fix our role).
	 */
	return pd_get_dual_role() == PD_DRP_TOGGLE_ON ? 1 : 0;
}

int pd_check_data_swap(int port, int data_role)
{
	/* Always allow data swap: we can be DFP or UFP for USB */
	return 1;
}

int pd_check_vconn_swap(int port)
{
	/*
	 * VCONN is provided directly by the battery(PPVAR_SYS)
	 * but use the same rules as power swap
	 */
	return pd_get_dual_role() == PD_DRP_TOGGLE_ON ? 1 : 0;
}

void pd_execute_data_swap(int port, int data_role)
{
	/* inform the host controller to change role */
	pd_send_host_event(PD_EVENT_DATA_SWAP);
}

void pd_check_pr_role(int port, int pr_role, int flags)
{
	/*
	 * If partner is dual-role power and dualrole toggling is on, consider
	 * if a power swap is necessary.
	 */
	if ((flags & PD_FLAGS_PARTNER_DR_POWER) &&
	    pd_get_dual_role() == PD_DRP_TOGGLE_ON) {
		/*
		 * If we are source and partner is externally powered,
		 * swap to become a sink.
		 */
		if ((flags & PD_FLAGS_PARTNER_EXTPOWER) &&
		    pr_role == PD_ROLE_SOURCE)
			pd_request_power_swap(port);
	}
}

void pd_check_dr_role(int port, int dr_role, int flags)
{
	/* if the partner is a DRP (e.g. laptop), try to switch to UFP */
	if ((flags & PD_FLAGS_PARTNER_DR_DATA) && dr_role == PD_ROLE_DFP)
		pd_request_data_swap(port);
}

/* ----------------- Vendor Defined Messages ------------------ */
const struct svdm_response svdm_rsp = {
	.identity = NULL,
	.svids = NULL,
	.modes = NULL,
};

int pd_custom_vdm(int port, int cnt, uint32_t *payload,
		  uint32_t **rpayload)
{
	int cmd = PD_VDO_CMD(payload[0]);
	uint16_t dev_id = 0;
	int is_rw, is_latest;

	/* make sure we have some payload */
	if (cnt == 0)
		return 0;

	switch (cmd) {
	case VDO_CMD_VERSION:
		/* guarantee last byte of payload is null character */
		*(payload + cnt - 1) = 0;
		CPRINTF("version: %s\n", (char *)(payload+1));
		break;
	case VDO_CMD_READ_INFO:
	case VDO_CMD_SEND_INFO:
		/* copy hash */
		if (cnt == 7) {
			dev_id = VDO_INFO_HW_DEV_ID(payload[6]);
			is_rw = VDO_INFO_IS_RW(payload[6]);
			is_latest = pd_dev_store_rw_hash(port,
							 dev_id,
							 payload + 1,
							 is_rw ?
							 SYSTEM_IMAGE_RW :
							 SYSTEM_IMAGE_RO);

			/*
			 * Send update host event unless our RW hash is
			 * already known to be the latest update RW.
			 */
			if (!is_rw || !is_latest)
				pd_send_host_event(PD_EVENT_UPDATE_DEVICE);

			CPRINTF("DevId:%d.%d SW:%d RW:%d\n",
				HW_DEV_ID_MAJ(dev_id),
				HW_DEV_ID_MIN(dev_id),
				VDO_INFO_SW_DBG_VER(payload[6]),
				is_rw);
		} else if (cnt == 6) {
			/* really old devices don't have last byte */
			pd_dev_store_rw_hash(port, dev_id, payload + 1,
					     SYSTEM_IMAGE_UNKNOWN);
		}
		break;
	case VDO_CMD_CURRENT:
		CPRINTF("Current: %dmA\n", payload[1]);
		break;
	case VDO_CMD_FLIP:
		usb_mux_flip(port);
		break;
#ifdef CONFIG_USB_PD_LOGGING
	case VDO_CMD_GET_LOG:
		pd_log_recv_vdm(port, cnt, payload);
		break;
#endif /* CONFIG_USB_PD_LOGGING */
#ifdef CONFIG_CASE_CLOSED_DEBUG
	case VDO_CMD_CCD_EN:
		ccd_set_mode(CCD_MODE_ENABLED);
		break;
#endif
	}

	return 0;
}

static int dp_flags;
/* DP Status VDM as returned by UFP */
static uint32_t dp_status;

static void svdm_safe_dp_mode(int port)
{
	/* make DP interface safe until configure */
	usb_mux_set(port, TYPEC_MUX_NONE, USB_SWITCH_CONNECT, 0);
	dp_flags = 0;
	dp_status = 0;
}

static int svdm_enter_dp_mode(int port, uint32_t mode_caps)
{
	/* Only enter mode if device is DFP_D capable */
	if (mode_caps & MODE_DP_SNK) {
		svdm_safe_dp_mode(port);
		return 0;
	}

	return -1;
}

static int svdm_dp_status(int port, uint32_t *payload)
{
	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
			 CMD_DP_STATUS | VDO_OPOS(opos));
	payload[1] = VDO_DP_STATUS(0, /* HPD IRQ  ... not applicable */
				   0, /* HPD level ... not applicable */
				   0, /* exit DP? ... no */
				   0, /* usb mode? ... no */
				   0, /* multi-function ... no */
				   (!!(dp_flags & DP_FLAGS_DP_ON)),
				   0, /* power low? ... no */
				   (!!(dp_flags & DP_FLAGS_DP_ON)));
	return 2;
};

static int svdm_dp_config(int port, uint32_t *payload)
{
	int opos = pd_alt_mode(port, USB_SID_DISPLAYPORT);
	int mf_pref = PD_VDO_DPSTS_MF_PREF(dp_status);
	int pin_mode = pd_dfp_dp_get_pin_mode(port, dp_status);

	if (!pin_mode)
		return 0;

	usb_mux_set(port, mf_pref ? TYPEC_MUX_DOCK : TYPEC_MUX_DP,
			  USB_SWITCH_CONNECT, pd_get_polarity(port));

	payload[0] = VDO(USB_SID_DISPLAYPORT, 1,
			 CMD_DP_CONFIG | VDO_OPOS(opos));
	payload[1] = VDO_DP_CFG(pin_mode,      /* pin mode */
				1,             /* DPv1.3 signaling */
				2);            /* UFP_U connected as UFP_D */
	return 2;
};

static void svdm_dp_post_config(int port)
{
	dp_flags |= DP_FLAGS_DP_ON;
	if (!(dp_flags & DP_FLAGS_HPD_HI_PENDING))
		return;

	gpio_set_level(GPIO_USBC_DP_HPD, 1);
}

static void hpd_irq_deferred(void)
{
	gpio_set_level(GPIO_USBC_DP_HPD, 1);
}
DECLARE_DEFERRED(hpd_irq_deferred);

static int svdm_dp_attention(int port, uint32_t *payload)
{
	int cur_lvl;
	int lvl = PD_VDO_DPSTS_HPD_LVL(payload[1]);
	int irq = PD_VDO_DPSTS_HPD_IRQ(payload[1]);
	cur_lvl = gpio_get_level(GPIO_USBC_DP_HPD);

	dp_status = payload[1];

	/* Its initial DP status message prior to config */
	if (!(dp_flags & DP_FLAGS_DP_ON)) {
		if (lvl)
			dp_flags |= DP_FLAGS_HPD_HI_PENDING;
		return 1;
	}

	if (irq & cur_lvl) {
		gpio_set_level(GPIO_USBC_DP_HPD, 0);
		hook_call_deferred(hpd_irq_deferred,
				   HPD_DSTREAM_DEBOUNCE_IRQ);
	} else if (irq & !cur_lvl) {
		CPRINTF("ERR:HPD:IRQ&LOW\n");
		return 0; /* nak */
	} else {
		gpio_set_level(GPIO_USBC_DP_HPD, lvl);
	}
	/* ack */
	return 1;
}

static void svdm_exit_dp_mode(int port)
{
	svdm_safe_dp_mode(port);
	gpio_set_level(GPIO_USBC_DP_HPD, 0);
}

static int svdm_enter_gfu_mode(int port, uint32_t mode_caps)
{
	/* Always enter GFU mode */
	return 0;
}

static void svdm_exit_gfu_mode(int port)
{
}

static int svdm_gfu_status(int port, uint32_t *payload)
{
	/*
	 * This is called after enter mode is successful, send unstructured
	 * VDM to read info.
	 */
	pd_send_vdm(port, USB_VID_GOOGLE, VDO_CMD_READ_INFO, NULL, 0);
	return 0;
}

static int svdm_gfu_config(int port, uint32_t *payload)
{
	return 0;
}

static int svdm_gfu_attention(int port, uint32_t *payload)
{
	return 0;
}

const struct svdm_amode_fx supported_modes[] = {
	{
		.svid = USB_SID_DISPLAYPORT,
		.enter = &svdm_enter_dp_mode,
		.status = &svdm_dp_status,
		.config = &svdm_dp_config,
		.post_config = &svdm_dp_post_config,
		.attention = &svdm_dp_attention,
		.exit = &svdm_exit_dp_mode,
	},
	{
		.svid = USB_VID_GOOGLE,
		.enter = &svdm_enter_gfu_mode,
		.status = &svdm_gfu_status,
		.config = &svdm_gfu_config,
		.attention = &svdm_gfu_attention,
		.exit = &svdm_exit_gfu_mode,
	}
};
const int supported_modes_cnt = ARRAY_SIZE(supported_modes);
