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/*
* This file is part of the coreboot project.
*
* Copyright 2018 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 <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
static struct acpi_dp *gpio_keys_add_child_node(
struct drivers_generic_gpio_keys_config *config,
const char *parent_path)
{
struct key_info *key = &config->key;
struct acpi_dp *dsd;
if (!key->dev_name || !key->linux_code)
return NULL;
dsd = acpi_dp_new_table(config->key.dev_name);
acpi_dp_add_integer(dsd, "linux,code", key->linux_code);
if (key->linux_input_type)
acpi_dp_add_integer(dsd, "linux,input-type",
key->linux_input_type);
if (key->label)
acpi_dp_add_string(dsd, "label", key->label);
if (key->wake) {
acpi_dp_add_integer(dsd, "wakeup-source", 1);
acpigen_write_PRW(key->wake, 3);
acpi_dp_add_integer(dsd, "wakeup-event-action",
key->wakeup_event_action);
}
if (key->can_be_disabled)
acpi_dp_add_integer(dsd, "linux,can-disable",
key->can_be_disabled);
if (key->debounce_interval)
acpi_dp_add_integer(dsd, "debounce-interval",
key->debounce_interval);
acpi_dp_add_gpio(dsd, "gpios", parent_path, 0, 0,
config->gpio.polarity);
return dsd;
}
static void gpio_keys_fill_ssdt_generator(struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
const char *scope = acpi_device_scope(dev);
const char *path = acpi_device_path(dev);
struct acpi_dp *dsd, *child;
const char *drv_string = config->is_polled ? "gpio-keys-polled"
: "gpio-keys";
if (!dev->enabled || !scope || !path || !config->gpio.pin_count)
return;
/* Device */
acpigen_write_scope(scope);
acpigen_write_device(acpi_device_name(dev));
/* _HID is set to PRP0001 */
acpigen_write_name_string("_HID", ACPI_DT_NAMESPACE_HID);
/* Resources - _CRS */
acpigen_write_name("_CRS");
acpigen_write_resourcetemplate_header();
acpi_device_write_gpio(&config->gpio);
acpigen_write_resourcetemplate_footer();
/* DSD */
dsd = acpi_dp_new_table("_DSD");
acpi_dp_add_string(dsd, "compatible", drv_string);
if (config->is_polled)
acpi_dp_add_integer(dsd, "poll-interval",
config->poll_interval);
/* Child device defining key */
child = gpio_keys_add_child_node(config, path);
if (child)
acpi_dp_add_child(dsd, "button-0", child);
acpi_dp_write(dsd);
acpigen_pop_len(); /* Device */
acpigen_pop_len(); /* Scope */
}
static const char *gpio_keys_acpi_name(const struct device *dev)
{
struct drivers_generic_gpio_keys_config *config = dev->chip_info;
static char name[5];
if (config->name)
return config->name;
snprintf(name, sizeof(name), "K%03.3X", config->gpio.pins[0]);
name[4] = '\0';
return name;
}
static struct device_operations gpio_keys_ops = {
.read_resources = DEVICE_NOOP,
.set_resources = DEVICE_NOOP,
.enable_resources = DEVICE_NOOP,
.acpi_name = gpio_keys_acpi_name,
.acpi_fill_ssdt_generator = gpio_keys_fill_ssdt_generator,
};
static void gpio_keys_enable(struct device *dev)
{
dev->ops = &gpio_keys_ops;
}
struct chip_operations drivers_generic_gpio_keys_ops = {
CHIP_NAME("GPIO Keys")
.enable_dev = gpio_keys_enable
};
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