i2c_tunnel.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <acpi/acpi_device.h>
#include <acpi/acpigen.h>
#include <console/console.h>
#include <device/device.h>
#include <device/path.h>
#include <string.h>
#include "chip.h"
 
#define CROS_EC_I2C_TUNNEL_HID          "GOOG0012"
#define CROS_EC_I2C_TUNNEL_DDN          "Cros EC I2C Tunnel"
 
static void crosec_i2c_tunnel_fill_ssdt(const struct device *dev)
{
        const char *scope = acpi_device_scope(dev);
        struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
        struct acpi_dp *dsd;
 
        if (!scope || !cfg)
                return;
 
        acpigen_write_scope(scope);
 
        acpigen_write_device(acpi_device_name(dev));
        acpigen_write_name_string("_HID", CROS_EC_I2C_TUNNEL_HID);
        acpigen_write_name_integer("_UID", cfg->uid);
        acpigen_write_name_string("_DDN", CROS_EC_I2C_TUNNEL_DDN);
        acpigen_write_STA(acpi_device_status(dev));
 
        dsd = acpi_dp_new_table("_DSD");
        acpi_dp_add_integer(dsd, "google,remote-bus", cfg->remote_bus);
        acpi_dp_write(dsd);
 
        acpigen_pop_len(); /* Device */
        acpigen_pop_len(); /* Scope */
 
        printk(BIOS_INFO, "%s: %s at %s\n", acpi_device_path(dev), CROS_EC_I2C_TUNNEL_DDN,
                                                dev_path(dev));
}
 
static const char *crosec_i2c_tunnel_acpi_name(const struct device *dev)
{
        struct ec_google_chromeec_i2c_tunnel_config *cfg = dev->chip_info;
        static char name[5];
 
        if (cfg->name)
                return cfg->name;
 
        snprintf(name, sizeof(name), "TUN%X", dev->path.generic.id);
        return name;
}
 
static struct device_operations crosec_i2c_tunnel_ops = {
        .read_resources         = noop_read_resources,
        .set_resources          = noop_set_resources,
        .acpi_name              = crosec_i2c_tunnel_acpi_name,
        .acpi_fill_ssdt         = crosec_i2c_tunnel_fill_ssdt,
        .scan_bus               = scan_static_bus,
};
 
static void crosec_i2c_tunnel_enable(struct device *dev)
{
        dev->ops = &crosec_i2c_tunnel_ops;
}
 
struct chip_operations ec_google_chromeec_i2c_tunnel_ops = {
        CHIP_NAME("CrosEC I2C Tunnel Device")
        .enable_dev = crosec_i2c_tunnel_enable
};