/* 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); 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 }; struct device *find_gfx_dev(void) { struct device *dev; for (dev = all_devices; dev; dev = dev->next) { if (dev->chip_ops && dev->chip_ops == &drivers_gfx_generic_ops) return dev; } return NULL; }