diff options
Diffstat (limited to 'src/drivers/generic/gpio_keys/gpio_keys.c')
-rw-r--r-- | src/drivers/generic/gpio_keys/gpio_keys.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/src/drivers/generic/gpio_keys/gpio_keys.c b/src/drivers/generic/gpio_keys/gpio_keys.c new file mode 100644 index 0000000000..cbaf8cfe4f --- /dev/null +++ b/src/drivers/generic/gpio_keys/gpio_keys.c @@ -0,0 +1,129 @@ +/* + * 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->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 +}; |