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/* Copyright (c) 2013 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 "acpi.h"
#include "common.h"
#include "console.h"
#include "dptf.h"
#include "lpc.h"
#include "ec_commands.h"
#include "pwm.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_LPC, outstr)
#define CPRINTF(format, args...) cprintf(CC_LPC, format, ## args)
static uint8_t acpi_cmd; /* Last received ACPI command */
static uint8_t acpi_addr; /* First byte of data after ACPI command */
static int acpi_data_count; /* Number of data writes after command */
static uint8_t acpi_mem_test; /* Test byte in ACPI memory space */
/* This handles AP writes to the EC via the ACPI I/O port. There are only a few
* ACPI commands (EC_CMD_ACPI_*), but they are all handled here.
*/
int acpi_ap_to_ec(int is_cmd, uint8_t value, uint8_t *resultptr)
{
int data = 0;
int retval = 0;
CPRINTF("[HEY: %T %s(%d, 0x%x)]\n", is_cmd, value);
/* Read command/data; this clears the FRMH status bit. */
if (is_cmd) {
acpi_cmd = value;
acpi_data_count = 0;
} else {
data = value;
/*
* The first data byte is the ACPI memory address for
* read/write commands.
*/
if (!acpi_data_count++)
acpi_addr = data;
}
/* Process complete commands */
if (acpi_cmd == EC_CMD_ACPI_READ && acpi_data_count == 1) {
/* ACPI read cmd + addr */
int result = 0xff; /* value for bogus read */
switch (acpi_addr) {
case EC_ACPI_MEM_VERSION:
result = EC_ACPI_MEM_VERSION_CURRENT;
break;
case EC_ACPI_MEM_TEST:
result = acpi_mem_test;
break;
case EC_ACPI_MEM_TEST_COMPLIMENT:
result = 0xff - acpi_mem_test;
break;
#ifdef CONFIG_PWM_KBLIGHT
case EC_ACPI_MEM_KEYBOARD_BACKLIGHT:
/*
* TODO(crosbug.com/p/23774): not very satisfying that
* LPC knows directly about the keyboard backlight, but
* for now this is good enough and less code than
* defining a new API for ACPI commands. If we start
* adding more commands, or need to support LPC on more
* than just LM4, fix this.
*/
result = pwm_get_duty(PWM_CH_KBLIGHT);
break;
#endif
#ifdef CONFIG_FANS
case EC_ACPI_MEM_FAN_DUTY:
/** TODO(crosbug.com/p/23774): Fix this too */
result = dptf_get_fan_duty_target();
break;
#endif
default:
break;
}
/* Send the result byte */
CPRINTF("[%T ACPI read 0x%02x = 0x%02x]\n", acpi_addr, result);
*resultptr = result;
retval = 1;
} else if (acpi_cmd == EC_CMD_ACPI_WRITE && acpi_data_count == 2) {
/* ACPI write cmd + addr + data */
switch (acpi_addr) {
case EC_ACPI_MEM_TEST:
CPRINTF("[%T ACPI mem test 0x%02x]\n", data);
acpi_mem_test = data;
break;
#ifdef CONFIG_PWM_KBLIGHT
case EC_ACPI_MEM_KEYBOARD_BACKLIGHT:
/*
* Debug output with CR not newline, because the host
* does a lot of keyboard backlights and it scrolls the
* debug console.
*/
CPRINTF("\r[%T ACPI kblight %d]", data);
pwm_set_duty(PWM_CH_KBLIGHT, data);
break;
#endif
#ifdef CONFIG_FANS
case EC_ACPI_MEM_FAN_DUTY:
/** TODO(crosbug.com/p/23774): Fix this too */
dptf_set_fan_duty_target(data);
break;
#endif
default:
CPRINTF("[%T ACPI write 0x%02x = 0x%02x]\n",
acpi_addr, data);
break;
}
/* At the moment, ACPI implies LPC. */
#ifdef CONFIG_LPC
} else if (acpi_cmd == EC_CMD_ACPI_QUERY_EVENT && !acpi_data_count) {
/* Clear and return the lowest host event */
int evt_index = lpc_query_host_event_state();
CPRINTF("[%T ACPI query = %d]\n", evt_index);
*resultptr = evt_index;
retval = 1;
#endif
}
return retval;
}
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