generic.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <acpi/acpigen.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
 
#include "chip.h"
 
#define ACPI_DSM_PRIVACY_SCREEN_UUID    "C7033113-8720-4CEB-9090-9D52B3E52D73"
 
#define ACPI_METHOD_EPS_PRESENT         "EPSP"
#define ACPI_METHOD_EPS_STATE           "EPSS"
#define ACPI_METHOD_EPS_ENABLE          "EPSE"
#define ACPI_METHOD_EPS_DISABLE         "EPSD"
 
static void privacy_screen_detect_cb(void *arg)
{
        struct drivers_gfx_generic_privacy_screen_config *config = arg;
 
        acpigen_write_store();
        acpigen_emit_namestring(config->detect_function);
        acpigen_emit_byte(LOCAL2_OP);
        acpigen_write_if_lequal_op_int(LOCAL2_OP, 1);
        acpigen_write_return_singleton_buffer(0xF);
        acpigen_pop_len();
}
static void privacy_screen_get_status_cb(void *arg)
{
        struct drivers_gfx_generic_privacy_screen_config *config = arg;
 
        acpigen_emit_byte(RETURN_OP);
        acpigen_emit_namestring(config->status_function);
}
static void privacy_screen_enable_cb(void *arg)
{
        struct drivers_gfx_generic_privacy_screen_config *config = arg;
 
        acpigen_emit_namestring(config->enable_function);
}
static void privacy_screen_disable_cb(void *arg)
{
        struct drivers_gfx_generic_privacy_screen_config *config = arg;
 
        acpigen_emit_namestring(config->disable_function);
}
 
static void (*privacy_screen_callbacks[])(void *) = {
        privacy_screen_detect_cb,
        privacy_screen_get_status_cb,
        privacy_screen_enable_cb,
        privacy_screen_disable_cb,
};
 
static void privacy_gpio_acpigen(struct acpi_gpio *gpio)
{
        /* EPS Present */
        acpigen_write_method(ACPI_METHOD_EPS_PRESENT, 0);
        acpigen_write_return_byte(1);
        acpigen_pop_len();
 
        /* EPS State */
        acpigen_write_method(ACPI_METHOD_EPS_STATE, 0);
        acpigen_get_rx_gpio(gpio);
        acpigen_emit_byte(RETURN_OP);
        acpigen_emit_byte(LOCAL0_OP);
        acpigen_pop_len();
 
        /* EPS Enable */
        acpigen_write_method(ACPI_METHOD_EPS_ENABLE, 0);
        acpigen_enable_tx_gpio(gpio);
        acpigen_pop_len();
 
        /* EPS Disable */
        acpigen_write_method(ACPI_METHOD_EPS_DISABLE, 0);
        acpigen_disable_tx_gpio(gpio);
        acpigen_pop_len();
}
 
static void gfx_fill_privacy_screen_dsm(
                struct drivers_gfx_generic_privacy_screen_config *privacy)
{
        if (!privacy->enabled)
                return;
 
        /* Populate ACPI methods, if EPS controlled via gpio */
        if (privacy->gpio.pin_count == 1) {
                privacy_gpio_acpigen(&privacy->gpio);
                privacy->detect_function = ACPI_METHOD_EPS_PRESENT;
                privacy->status_function = ACPI_METHOD_EPS_STATE;
                privacy->enable_function = ACPI_METHOD_EPS_ENABLE;
                privacy->disable_function = ACPI_METHOD_EPS_DISABLE;
        }
 
        acpigen_write_dsm(ACPI_DSM_PRIVACY_SCREEN_UUID,
                privacy_screen_callbacks,
                ARRAY_SIZE(privacy_screen_callbacks),
                privacy);
}
 
static void gfx_fill_ssdt_generator(const struct device *dev)
{
        size_t i;
        struct drivers_gfx_generic_config *config = dev->chip_info;
 
        const char *scope = acpi_device_scope(dev);
 
        if (!scope)
                return;
 
        acpigen_write_scope(scope);
 
        /* Method (_DOD, 0) */
        acpigen_write_method("_DOD", 0);
        acpigen_emit_byte(RETURN_OP);
        acpigen_write_package(config->device_count);
        for (i = 0; i < config->device_count; i++)
                acpigen_write_dword(config->device[i].addr);
        acpigen_pop_len(); /* End Package. */
        acpigen_pop_len(); /* End Method. */
 
        for (i = 0; i < config->device_count; i++) {
                acpigen_write_device(config->device[i].name);
                if (config->device[i].hid)
                        acpigen_write_name_string("_HID", config->device[i].hid);
                else
                        acpigen_write_name_integer("_ADR", config->device[i].addr);
 
                acpigen_write_name_integer("_STA", 0xF);
                gfx_fill_privacy_screen_dsm(&config->device[i].privacy);
                acpigen_pop_len(); /* Device */
        }
        acpigen_pop_len(); /* Scope */
}
 
static const char *gfx_acpi_name(const struct device *dev)
{
        struct drivers_gfx_generic_config *config = dev->chip_info;
 
        return config->name ? : "GFX0";
}
 
static struct device_operations gfx_ops = {
        .acpi_name      = gfx_acpi_name,
        .acpi_fill_ssdt = gfx_fill_ssdt_generator,
};
 
static void gfx_enable(struct device *dev)
{
        struct drivers_gfx_generic_config *config = dev->chip_info;
 
        if (!config || !dev->enabled)
                return;
 
        dev->ops = &gfx_ops;
}
 
struct chip_operations drivers_gfx_generic_ops = {
        CHIP_NAME("Generic Graphics Device")
        .enable_dev = gfx_enable
};