usb_acpi.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpi_device.h>
#include <acpi/acpi_pld.h>
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include "chip.h"
 
static bool usb_acpi_add_gpios_to_crs(struct drivers_usb_acpi_config *cfg)
{
        if (cfg->privacy_gpio.pin_count)
                return true;
 
        if (cfg->reset_gpio.pin_count && !cfg->has_power_resource)
                return true;
 
        return false;
}
 
static int usb_acpi_write_gpio(struct acpi_gpio *gpio, int *curr_index)
{
        int ret = -1;
 
        if (gpio->pin_count == 0)
                return ret;
 
        acpi_device_write_gpio(gpio);
        ret = *curr_index;
        (*curr_index)++;
 
        return ret;
}
 
static void usb_acpi_fill_ssdt_generator(const struct device *dev)
{
        struct drivers_usb_acpi_config *config = dev->chip_info;
        const char *path = acpi_device_path(dev);
        struct acpi_pld pld;
 
        if (!path || !config)
                return;
 
        /* Don't generate output for hubs, only ports */
        if (config->type == UPC_TYPE_HUB)
                return;
 
        acpigen_write_scope(path);
        if (config->desc)
                acpigen_write_name_string("_DDN", config->desc);
        acpigen_write_upc(config->type);
 
        if (usb_acpi_get_pld(dev, &pld))
                acpigen_write_pld(&pld);
        else
                printk(BIOS_ERR, "Error retrieving PLD for %s\n", path);
 
        /* Resources */
        if (usb_acpi_add_gpios_to_crs(config) == true) {
                struct acpi_dp *dsd;
                int idx = 0;
                int reset_gpio_index = -1;
                int privacy_gpio_index;
 
                acpigen_write_name("_CRS");
                acpigen_write_resourcetemplate_header();
                if (!config->has_power_resource) {
                        reset_gpio_index = usb_acpi_write_gpio(
                                                &config->reset_gpio, &idx);
                }
                privacy_gpio_index = usb_acpi_write_gpio(&config->privacy_gpio,
                                                         &idx);
                acpigen_write_resourcetemplate_footer();
 
                dsd = acpi_dp_new_table("_DSD");
                if (reset_gpio_index >= 0)
                        acpi_dp_add_gpio(dsd, "reset-gpio", path,
                                         reset_gpio_index, 0,
                                         config->reset_gpio.active_low);
                if (privacy_gpio_index >= 0)
                        acpi_dp_add_gpio(dsd, "privacy-gpio", path,
                                         privacy_gpio_index, 0,
                                         config->privacy_gpio.active_low);
                acpi_dp_write(dsd);
        }
 
        if (config->has_power_resource) {
                const struct acpi_power_res_params power_res_params = {
                        &config->reset_gpio,
                        config->reset_delay_ms,
                        config->reset_off_delay_ms,
                        &config->enable_gpio,
                        config->enable_delay_ms,
                        config->enable_off_delay_ms,
                        NULL,
                        0,
                        0,
                        config->use_gpio_for_status
                };
                acpi_device_add_power_res(&power_res_params);
        }
 
        acpigen_pop_len();
 
        printk(BIOS_INFO, "%s: %s at %s\n", path,
               config->desc ? : dev->chip_ops->name, dev_path(dev));
}
 
static struct device_operations usb_acpi_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .scan_bus               = scan_static_bus,
        .acpi_fill_ssdt         = usb_acpi_fill_ssdt_generator,
};
 
static void usb_acpi_enable(struct device *dev)
{
        dev->ops = &usb_acpi_ops;
}
 
struct chip_operations drivers_usb_acpi_ops = {
        CHIP_NAME("USB ACPI Device")
        .enable_dev = usb_acpi_enable
};
 
bool usb_acpi_get_pld(const struct device *usb_device, struct acpi_pld *pld)
{
        struct drivers_usb_acpi_config *config;
 
        if (!usb_device || !usb_device->chip_info ||
                usb_device->chip_ops != &drivers_usb_acpi_ops)
                return false;
 
        config = usb_device->chip_info;
        if (config->use_custom_pld)
                *pld = config->custom_pld;
        else
                acpi_pld_fill_usb(pld, config->type, &config->group);
 
        return true;
}