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/* Copyright 2020 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.
*
* IT5205 Type-C SBU OVP handler
*/
#include "console.h"
#include "hooks.h"
#include "it5205.h"
#include "stdbool.h"
#include "timer.h"
#include "usb_mux.h"
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
#define OVP_RETRY_DELAY_US_MIN (100 * MSEC)
static unsigned int ovp_retry_delay_us = OVP_RETRY_DELAY_US_MIN;
static void reset_retry_delay(void)
{
CPRINTS("IT5205 SBU OVP cleared");
ovp_retry_delay_us = OVP_RETRY_DELAY_US_MIN;
}
DECLARE_DEFERRED(reset_retry_delay);
static void reset_csbu(void)
{
/* double the retry time up to 1 minute */
ovp_retry_delay_us = MIN(ovp_retry_delay_us * 2, MINUTE);
/* and reset it if interrupt not triggered in a short period */
hook_call_deferred(&reset_retry_delay_data, 500 * MSEC);
/* re-enable sbu interrupt */
it5205h_enable_csbu_switch(&usb_muxes[0], false);
it5205h_enable_csbu_switch(&usb_muxes[0], true);
}
DECLARE_DEFERRED(reset_csbu);
static void it5205h_hook_ac_change(void)
{
int reg;
/* Check if the board has IT5205H, and read its ovp status */
if (i2c_read8(I2C_PORT_USB_MUX0, IT5205H_SBU_I2C_ADDR_FLAGS,
IT5205H_REG_ISR, ®))
return;
/*
* Re-poll ovp status immediately if AC detached, because ovp will
* likely be recovered.
*
* Always perform the re-poll even when this hook is triggered by
* unrelated events.
*/
if (reg & IT5205H_ISR_CSBU_OVP)
hook_call_deferred(&reset_csbu_data, 0);
}
DECLARE_HOOK(HOOK_AC_CHANGE, it5205h_hook_ac_change, HOOK_PRIO_DEFAULT);
void it5205h_sbu_interrupt(enum gpio_signal signal)
{
CPRINTS("IT5205 SBU OVP triggered");
hook_call_deferred(&reset_csbu_data, ovp_retry_delay_us);
hook_call_deferred(&reset_retry_delay_data, -1);
}
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