| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpi_device.h> |
| #include <acpi/acpigen.h> |
| #include <device/pci.h> |
| #include <device/pci_ids.h> |
| |
| #define ATIF_FUNCTION_VERIFY_INTERFACE 0x0 |
| struct atif_verify_interface_output { |
| uint16_t size; /* Size of this object, including size field */ |
| uint16_t version; |
| uint32_t supported_notifications; |
| uint32_t supported_functions; /* Bit n set if function n+1 supported. */ |
| }; |
| |
| #define ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS 0x10 |
| # define ATIF_QBTC_REQUEST_LCD1 0 |
| /* error codes */ |
| # define ATIF_QBTC_ERROR_CODE_SUCCESS 0 |
| # define ATIF_QBTC_ERROR_CODE_FAILURE 1 |
| # define ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED 2 |
| struct atif_brightness_input { |
| uint16_t size; |
| /* ATIF doc indicates this field is a word, but the kernel drivers uses a byte. */ |
| uint8_t requested_display; |
| }; |
| struct atif_brightness_output { |
| uint16_t size; /* Size of this object, including size field. */ |
| uint16_t flags; /* Currently all reserved. */ |
| uint8_t error_code; |
| /* default brightness fields currently ignored by Linux driver. */ |
| uint8_t default_brightness_ac; /* Percentage brightness when connected to AC. */ |
| uint8_t default_brightness_dc; /* Percentage brightness when connected to DC. */ |
| /* The following 2 fields are the only ones honored by Linux driver currently. */ |
| uint8_t min_input_signal_level; /* 0-255 corresponding to 0% */ |
| uint8_t max_input_signal_level; /* 0-255 corresponding to 100% */ |
| /* Array of data points consisting of: |
| * { uint8_t luminance_level; (percent) |
| * uint8_t input_signal_level; (0-255 in value) } |
| * Linux ignores these fields so no support currently. */ |
| uint8_t count_data_points; /* Count of data points. */ |
| }; |
| |
| static void generate_atif(const struct device *dev) |
| { |
| struct atif_verify_interface_output verify_output = { |
| .size = sizeof(verify_output), |
| .version = 1, |
| .supported_functions = |
| BIT(ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS - 1), |
| }; |
| struct atif_brightness_output brightness_error = { |
| .size = sizeof(brightness_error), |
| .error_code = ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED, |
| }; |
| struct atif_brightness_output brightness_out = { |
| .size = sizeof(brightness_out), |
| .error_code = ATIF_QBTC_ERROR_CODE_SUCCESS, |
| .min_input_signal_level = 0, |
| .max_input_signal_level = 255, |
| }; |
| |
| /* Scope (\_SB.PCI0.PBRA.IGFX) */ |
| acpigen_write_scope(acpi_device_path(dev)); |
| /* Method (ATIF, 2, NotSerialized) */ |
| acpigen_write_method("ATIF", 2); |
| /* ToInteger (Arg0, Local0) */ |
| acpigen_write_to_integer(ARG0_OP, LOCAL0_OP); |
| |
| /* If ((Local0 == Zero)) */ |
| acpigen_write_if_lequal_op_int(LOCAL0_OP, ATIF_FUNCTION_VERIFY_INTERFACE); |
| /* Return (Buffer (0x0C) { ... } */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&verify_output, |
| sizeof(verify_output)); |
| acpigen_pop_len(); /* if (LEqual(Local0, 0) */ |
| |
| /* ElseIf ((Local0 == 0x10)) */ |
| acpigen_write_else(); |
| acpigen_write_if_lequal_op_int(LOCAL0_OP, |
| ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS); |
| /* CreateByteField (Arg1, 0x02, DISP) */ |
| acpigen_write_create_byte_field(ARG1_OP, |
| offsetof(struct atif_brightness_input, requested_display), "DISP"); |
| /* ToInteger (DISP, Local1) */ |
| acpigen_write_to_integer_from_namestring("DISP", LOCAL1_OP); |
| /* If ((Local1 == Zero)) */ |
| acpigen_write_if_lequal_op_int(LOCAL1_OP, ATIF_QBTC_REQUEST_LCD1); |
| /* Return (Buffer (0x0A) { ... } */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_out, |
| sizeof(brightness_out)); |
| acpigen_pop_len(); /* if (LEqual(Local2, ATIF_QBTC_REQUEST_LCD1) */ |
| /* Else */ |
| acpigen_write_else(); |
| /* Return (Buffer (0x0A) */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_error, |
| sizeof(brightness_error)); |
| acpigen_pop_len(); /* else */ |
| |
| acpigen_pop_len(); /* if (LEqual(Local0, 0x10) */ |
| acpigen_pop_len(); /* else */ |
| |
| acpigen_pop_len(); /* Method */ |
| acpigen_pop_len(); /* Scope */ |
| } |
| |
| static void graphics_fill_ssdt(const struct device *dev) |
| { |
| acpi_device_write_pci_dev(dev); |
| pci_rom_ssdt(dev); |
| if (CONFIG(SOC_AMD_COMMON_BLOCK_GRAPHICS_ATIF)) |
| generate_atif(dev); |
| } |
| |
| static const char *graphics_acpi_name(const struct device *dev) |
| { |
| return "IGFX"; |
| } |
| |
| static const struct device_operations graphics_ops = { |
| .read_resources = pci_dev_read_resources, |
| .set_resources = pci_dev_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .init = pci_dev_init, |
| .ops_pci = &pci_dev_ops_pci, |
| .write_acpi_tables = pci_rom_write_acpi_tables, |
| .acpi_fill_ssdt = graphics_fill_ssdt, |
| .acpi_name = graphics_acpi_name, |
| }; |
| |
| static const unsigned short pci_device_ids[] = { |
| PCI_DEVICE_ID_AMD_FAM17H_GPU, |
| 0, |
| }; |
| |
| static const struct pci_driver graphics_driver __pci_driver = { |
| .ops = &graphics_ops, |
| .vendor = PCI_VENDOR_ID_ATI, |
| .devices = pci_device_ids, |
| }; |