| /* |
| * 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 <console/console.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->is_wakeup_source) |
| acpi_dp_add_integer(dsd, "wakeup-source", |
| key->is_wakeup_source); |
| if (key->wake) { |
| 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 |
| }; |