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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.
*/
#include "i2c.h"
#include "fusb302b.h"
#include "gpio.h"
#include "hooks.h"
#include "ioexpanders.h"
#include "util.h"
#include "task.h"
#include "time.h"
#include "usb_pd.h"
static int port;
static int status0;
static int status1;
static int interrupt;
static struct mutex measure_lock;
static int tcpc_write(int reg, int val)
{
return i2c_write8(port, FUSB302_I2C_ADDR_FLAGS, reg, val);
}
static int tcpc_read(int reg, int *val)
{
return i2c_read8(port, FUSB302_I2C_ADDR_FLAGS, reg, val);
}
int init_fusb302b(int p)
{
int ret;
int reg;
int interrupta;
int interruptb;
/* Configure fusb302b for SNK only operation */
port = p;
ret = tcpc_write(TCPC_REG_RESET, TCPC_REG_RESET_SW_RESET);
if (ret)
return ret;
/* Create interrupt masks */
reg = 0xFF;
/* CC level changes */
reg &= ~TCPC_REG_MASK_BC_LVL;
/* misc alert */
reg &= ~TCPC_REG_MASK_ALERT;
/* VBUS threshold crossed (~4.0V) */
reg &= ~TCPC_REG_MASK_VBUSOK;
tcpc_write(TCPC_REG_MASK, reg);
/* Interrupt Enable */
ret = tcpc_read(TCPC_REG_CONTROL0, ®);
if (ret)
return ret;
reg &= ~TCPC_REG_CONTROL0_INT_MASK;
ret = tcpc_write(TCPC_REG_CONTROL0, reg);
if (ret)
return ret;
ret = tcpc_write(TCPC_REG_POWER, TCPC_REG_POWER_PWR_ALL);
if (ret)
return ret;
/* reading interrupt registers clears them */
ret = tcpc_read(TCPC_REG_INTERRUPT, &interrupt);
if (ret)
return ret;
ret = tcpc_read(TCPC_REG_INTERRUPTA, &interrupta);
if (ret)
return ret;
ret = tcpc_read(TCPC_REG_INTERRUPTB, &interruptb);
if (ret)
return ret;
/* Call this, will detect a charger that's already plugged in */
update_status_fusb302b();
/* Enable interrupt */
gpio_enable_interrupt(GPIO_CHGSRV_TCPC_INT_ODL);
return EC_SUCCESS;
}
void fusb302b_irq(void)
{
tcpc_read(TCPC_REG_INTERRUPT, &interrupt);
tcpc_read(TCPC_REG_STATUS0, &status0);
tcpc_read(TCPC_REG_STATUS1, &status1);
task_wake(TASK_ID_PD_C2);
}
DECLARE_DEFERRED(fusb302b_irq);
int update_status_fusb302b(void)
{
hook_call_deferred(&fusb302b_irq_data, 0);
return EC_SUCCESS;
}
int is_vbus_present(void)
{
return (status0 & 0x80);
}
/* Convert BC LVL values (in FUSB302) to Type-C CC Voltage Status */
static int convert_bc_lvl(int bc_lvl)
{
int ret;
switch (bc_lvl) {
case 1:
ret = TYPEC_CC_VOLT_RP_DEF;
break;
case 2:
ret = TYPEC_CC_VOLT_RP_1_5;
break;
case 3:
ret = TYPEC_CC_VOLT_RP_3_0;
break;
default:
ret = TYPEC_CC_VOLT_OPEN;
}
return ret;
}
int get_cc(int *cc1, int *cc2)
{
int reg;
int orig_meas_cc1;
int orig_meas_cc2;
int bc_lvl_cc1;
int bc_lvl_cc2;
mutex_lock(&measure_lock);
/*
* Measure CC1 first.
*/
tcpc_read(TCPC_REG_SWITCHES0, ®);
/* save original state to be returned to later... */
if (reg & TCPC_REG_SWITCHES0_MEAS_CC1)
orig_meas_cc1 = 1;
else
orig_meas_cc1 = 0;
if (reg & TCPC_REG_SWITCHES0_MEAS_CC2)
orig_meas_cc2 = 1;
else
orig_meas_cc2 = 0;
/* Disable CC2 measurement switch, enable CC1 measurement switch */
reg &= ~TCPC_REG_SWITCHES0_MEAS_CC2;
reg |= TCPC_REG_SWITCHES0_MEAS_CC1;
tcpc_write(TCPC_REG_SWITCHES0, reg);
/* CC1 is now being measured by FUSB302. */
/* Wait on measurement */
usleep(250);
tcpc_read(TCPC_REG_STATUS0, &bc_lvl_cc1);
/* mask away unwanted bits */
bc_lvl_cc1 &= (TCPC_REG_STATUS0_BC_LVL0 | TCPC_REG_STATUS0_BC_LVL1);
/*
* Measure CC2 next.
*/
tcpc_read(TCPC_REG_SWITCHES0, ®);
/* Disable CC1 measurement switch, enable CC2 measurement switch */
reg &= ~TCPC_REG_SWITCHES0_MEAS_CC1;
reg |= TCPC_REG_SWITCHES0_MEAS_CC2;
tcpc_write(TCPC_REG_SWITCHES0, reg);
/* CC2 is now being measured by FUSB302. */
/* Wait on measurement */
usleep(250);
tcpc_read(TCPC_REG_STATUS0, &bc_lvl_cc2);
/* mask away unwanted bits */
bc_lvl_cc2 &= (TCPC_REG_STATUS0_BC_LVL0 | TCPC_REG_STATUS0_BC_LVL1);
*cc1 = convert_bc_lvl(bc_lvl_cc1);
*cc2 = convert_bc_lvl(bc_lvl_cc2);
/* return MEAS_CC1/2 switches to original state */
tcpc_read(TCPC_REG_SWITCHES0, ®);
if (orig_meas_cc1)
reg |= TCPC_REG_SWITCHES0_MEAS_CC1;
else
reg &= ~TCPC_REG_SWITCHES0_MEAS_CC1;
if (orig_meas_cc2)
reg |= TCPC_REG_SWITCHES0_MEAS_CC2;
else
reg &= ~TCPC_REG_SWITCHES0_MEAS_CC2;
tcpc_write(TCPC_REG_SWITCHES0, reg);
mutex_unlock(&measure_lock);
return 0;
}
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