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/*
* This file is part of the coreboot project.
*
* Copyright 2016 Google Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/acpi_device.h>
#include <arch/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <gpio.h>
#include <stdint.h>
#include <string.h>
#include "chip.h"
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
#define MAX98357A_ACPI_NAME "MAXM"
#define MAX98357A_ACPI_HID "MX98357A"
static void max98357a_fill_ssdt(struct device *dev)
{
struct drivers_generic_max98357a_config *config = dev->chip_info;
const char *path;
struct acpi_dp *dp;
if (!dev->enabled || !config)
return;
/* Device */
acpigen_write_scope(acpi_device_scope(dev));
acpigen_write_device(acpi_device_name(dev));
acpigen_write_name_string("_HID", MAX98357A_ACPI_HID);
acpigen_write_name_integer("_UID", 0);
acpigen_write_name_string("_DDN", dev->chip_ops->name);
acpigen_write_STA(acpi_device_status(dev));
/* Resources */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(&config->sdmode_gpio);
acpigen_write_resourcetemplate_footer();
/* _DSD for devicetree properties */
/* This points to the first pin in the first gpio entry in _CRS */
path = acpi_device_path(dev);
dp = acpi_dp_new_table("_DSD");
acpi_dp_add_gpio(dp, "sdmode-gpio", path, 0, 0,
config->sdmode_gpio.polarity);
acpi_dp_add_integer(dp, "sdmode-delay", config->sdmode_delay);
acpi_dp_write(dp);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
printk(BIOS_INFO, "%s: %s\n", path, dev->chip_ops->name);
}
static const char *max98357a_acpi_name(const struct device *dev)
{
return MAX98357A_ACPI_NAME;
}
#endif
static struct device_operations max98357a_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
#if IS_ENABLED(CONFIG_HAVE_ACPI_TABLES)
.acpi_name = &max98357a_acpi_name,
.acpi_fill_ssdt_generator = &max98357a_fill_ssdt,
#endif
};
static void max98357a_enable(struct device *dev)
{
struct drivers_generic_max98357a_config *config = dev->chip_info;
/* Check if device is present by reading GPIO */
if (config->device_present_gpio) {
int present = gpio_get(config->device_present_gpio);
present ^= config->device_present_gpio_invert;
printk(BIOS_INFO, "%s is %spresent\n",
dev->chip_ops->name, present ? "" : "not ");
if (!present) {
dev->enabled = 0;
return;
}
}
dev->ops = &max98357a_ops;
}
struct chip_operations drivers_generic_max98357a_ops = {
CHIP_NAME("Maxim Integrated 98357A Amplifier")
.enable_dev = &max98357a_enable
};
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