/* 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 ------------------------- */