/* * 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_STATUS_DEVICE_ALL_ON); /* 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 };