src/acpi/acpigen_dsm.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <acpi/acpigen.h>
   4 #include <acpi/acpigen_dsm.h>
   5
   6 /* -------------------  I2C HID DSM ---------------------------- */
   7
   8 #define ACPI_DSM_I2C_HID_UUID           "3CDFF6F7-4267-4555-AD05-B30A3D8938DE"
   9
  10 /* I2C HID currently supports revision 1 only, for which, only 1 additional
  11  * function is supported. Thus, the query function should return 0x3:
  12  *      bit 0 = additional function supported
  13  *      bit 1 = function with index 1 supported
  14  * All other revisions do not support additional functions and hence return 0
  15 */
  16
  17 static void i2c_hid_func0_cb(void *arg)
  18 {
  19         /* ToInteger (Arg1, Local2) */
  20         acpigen_write_to_integer(ARG1_OP, LOCAL2_OP);
  21         /* If (LEqual (Local2, 0x1)) */
  22         acpigen_write_if_lequal_op_int(LOCAL2_OP, 0x1);
  23         /*   Return (Buffer (One) { 0x3 }) */
  24         acpigen_write_return_singleton_buffer(0x3);
  25         /* Else */
  26         acpigen_write_else();
  27         /*     Return (Buffer (One) { 0x0 }) */
  28         acpigen_write_return_singleton_buffer(0x0);
  29         acpigen_pop_len();      /* Pop : Else */
  30 }
  31
  32 static void i2c_hid_func1_cb(void *arg)
  33 {
  34         struct dsm_i2c_hid_config *config = arg;
  35         acpigen_write_return_byte(config->hid_desc_reg_offset);
  36 }
  37
  38 static void (*i2c_hid_callbacks[2])(void *) = {
  39         i2c_hid_func0_cb,
  40         i2c_hid_func1_cb,
  41 };
  42
  43 void acpigen_write_dsm_i2c_hid(struct dsm_i2c_hid_config *config)
  44 {
  45         acpigen_write_dsm(ACPI_DSM_I2C_HID_UUID, i2c_hid_callbacks,
  46                           ARRAY_SIZE(i2c_hid_callbacks), config);
  47 }
  48
  49 /* ------------------- End: I2C HID DSM ------------------------- */
  50
  51 #define USB_DSM_UUID    "CE2EE385-00E6-48CB-9F05-2EDB927C4899"
  52
  53 static void usb_dsm_func5_cb(void *arg)
  54 {
  55         struct dsm_usb_config *config = arg;
  56         acpigen_write_return_byte(config->usb_lpm_incapable);
  57 }
  58
  59 static void (*usb_dsm_callbacks[6])(void *) = {
  60         NULL,
  61         NULL,
  62         NULL,
  63         NULL,
  64         NULL,
  65         usb_dsm_func5_cb,
  66 };
  67
  68 void acpigen_write_dsm_usb(struct dsm_usb_config *config)
  69 {
  70         acpigen_write_dsm(USB_DSM_UUID, usb_dsm_callbacks,
  71                           ARRAY_SIZE(usb_dsm_callbacks), config);
  72 }