| /* |
| * 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 |
| }; |