| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <acpi/acpigen.h> |
| #include <acpi/acpigen_dsm.h> |
| |
| /* ------------------- I2C HID DSM ---------------------------- */ |
| |
| #define ACPI_DSM_I2C_HID_UUID "3CDFF6F7-4267-4555-AD05-B30A3D8938DE" |
| |
| /* I2C HID currently supports revision 1 only, for which, only 1 additional |
| * function is supported. Thus, the query function should return 0x3: |
| * bit 0 = additional function supported |
| * bit 1 = function with index 1 supported |
| * All other revisions do not support additional functions and hence return 0 |
| */ |
| |
| static void i2c_hid_func0_cb(void *arg) |
| { |
| /* ToInteger (Arg1, Local2) */ |
| acpigen_write_to_integer(ARG1_OP, LOCAL2_OP); |
| /* If (LEqual (Local2, 0x1)) */ |
| acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x1); |
| /* Return (Buffer (One) { 0x3 }) */ |
| acpigen_write_return_singleton_buffer(0x3); |
| /* Else */ |
| acpigen_write_else(); |
| /* Return (Buffer (One) { 0x0 }) */ |
| acpigen_write_return_singleton_buffer(0x0); |
| acpigen_pop_len(); /* Pop : Else */ |
| } |
| |
| static void i2c_hid_func1_cb(void *arg) |
| { |
| struct dsm_i2c_hid_config *config = arg; |
| acpigen_write_return_byte(config->hid_desc_reg_offset); |
| } |
| |
| static void (*i2c_hid_callbacks[2])(void *) = { |
| i2c_hid_func0_cb, |
| i2c_hid_func1_cb, |
| }; |
| |
| void acpigen_write_dsm_i2c_hid(struct dsm_i2c_hid_config *config) |
| { |
| acpigen_write_dsm(ACPI_DSM_I2C_HID_UUID, i2c_hid_callbacks, |
| ARRAY_SIZE(i2c_hid_callbacks), config); |
| } |
| |
| /* ------------------- End: I2C HID DSM ------------------------- */ |