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/* Copyright 2021 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 <stddef.h>
#include "cbi_ssfc.h"
#include "gpio.h"
#include "hooks.h"
#include "keyboard_8042.h"
#include "ps2.h"
#include "ps2_chip.h"
#include "time.h"
#include "registers.h"
#define PS2_TRANSMIT_DELAY_MS 10
void send_aux_data_to_device(uint8_t data)
{
ps2_transmit_byte(PRIMUS_PS2_CH, data);
}
static void board_init(void)
{
ps2_enable_channel(PRIMUS_PS2_CH, 1, send_aux_data_to_host_interrupt);
}
DECLARE_HOOK(HOOK_INIT, board_init, HOOK_PRIO_DEFAULT);
/*
* Goodix touchpad AVDD need to pull low to 0V when poweroff.
* Setting PS2 module in GPIO.inc will let AVDD have 0.9V offset.
* So we need to enable PS2 module later than PLTRST# to avoid the 0.9V
* offset.
*/
static void enable_ps2(void)
{
gpio_set_alternate_function(GPIO_PORT_6,
BIT(2) | BIT(3), GPIO_ALT_FUNC_DEFAULT);
}
DECLARE_DEFERRED(enable_ps2);
static void disable_ps2(void)
{
gpio_set_flags(GPIO_EC_PS2_SCL_TPAD, GPIO_ODR_LOW);
gpio_set_flags(GPIO_EC_PS2_SDA_TPAD, GPIO_ODR_LOW);
gpio_set_alternate_function(GPIO_PORT_6,
BIT(2) | BIT(3), GPIO_ALT_FUNC_NONE);
/* make sure PLTRST# goes high and re-enable ps2.*/
hook_call_deferred(&enable_ps2_data, 2 * SECOND);
}
DECLARE_HOOK(HOOK_CHIPSET_RESET, disable_ps2, HOOK_PRIO_DEFAULT);
static void ps2_transmit(uint8_t cmd)
{
ps2_transmit_byte(PRIMUS_PS2_CH, cmd);
msleep(PS2_TRANSMIT_DELAY_MS);
}
static void send_command_to_trackpoint(uint8_t command1, uint8_t command2)
{
/*
* Send command to trackpoint and wait,
* this will make sure EC get ACK from PS2 device
* and send the next command.
*/
ps2_transmit(TP_COMMAND);
ps2_transmit(TP_TOGGLE);
ps2_transmit(command1);
ps2_transmit(command2);
}
int get_trackpoint_id(void)
{
if (get_cbi_ssfc_trackpoint() == SSFC_SENSOR_TRACKPOINT_ELAN)
return TP_VARIANT_ELAN;
else
return TP_VARIANT_SYNAPTICS;
}
/* Called on AP S0 -> S3 transition */
static void ps2_suspend(void)
{
int trackpoint_id;
/*
* When EC send PS2 command to PS2 device,
* PS2 device will return ACK(0xFA).
* EC will send it to host and cause host wake from suspend.
* So disable EC send data to host to avoid it.
*/
ps2_enable_channel(PRIMUS_PS2_CH, 1, NULL);
trackpoint_id = get_trackpoint_id();
/*
* Send suspend mode to trackpoint
* Those commands was provide by Elan and Synaptics
*/
if (trackpoint_id == TP_VARIANT_ELAN)
send_command_to_trackpoint(TP_TOGGLE_BURST,
TP_TOGGLE_ELAN_SLEEP);
else if (trackpoint_id == TP_VARIANT_SYNAPTICS)
send_command_to_trackpoint(TP_TOGGLE_SOURCE_TAG,
TP_TOGGLE_SNAPTICS_SLEEP);
}
DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, ps2_suspend, HOOK_PRIO_DEFAULT);
/* Called on AP S3 -> S0 transition */
static void ps2_resume(void)
{
int trackpoint_id;
trackpoint_id = get_trackpoint_id();
ps2_enable_channel(PRIMUS_PS2_CH, 1, send_aux_data_to_host_interrupt);
/*
* For Synaptics trackpoint, EC need to send command to it again.
* For Elan trackpoint, we just need to touch trackpoint and it wake.
*/
if (trackpoint_id == TP_VARIANT_SYNAPTICS)
send_command_to_trackpoint(TP_TOGGLE_SOURCE_TAG,
TP_TOGGLE_SNAPTICS_SLEEP);
}
DECLARE_HOOK(HOOK_CHIPSET_RESUME, ps2_resume, HOOK_PRIO_DEFAULT);
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