mxm-wmi.c 1.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * MXM WMI driver
  4. *
  5. * Copyright(C) 2010 Red Hat.
  6. */
  7. #include <linux/kernel.h>
  8. #include <linux/module.h>
  9. #include <linux/init.h>
  10. #include <linux/mxm-wmi.h>
  11. #include <linux/acpi.h>
  12. MODULE_AUTHOR("Dave Airlie");
  13. MODULE_DESCRIPTION("MXM WMI Driver");
  14. MODULE_LICENSE("GPL");
  15. #define MXM_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
  16. MODULE_ALIAS("wmi:"MXM_WMMX_GUID);
  17. #define MXM_WMMX_FUNC_MXDS 0x5344584D /* "MXDS" */
  18. #define MXM_WMMX_FUNC_MXMX 0x53445344 /* "MXMX" */
  19. struct mxds_args {
  20. u32 func;
  21. u32 args;
  22. u32 xarg;
  23. };
  24. int mxm_wmi_call_mxds(int adapter)
  25. {
  26. struct mxds_args args = {
  27. .func = MXM_WMMX_FUNC_MXDS,
  28. .args = 0,
  29. .xarg = 1,
  30. };
  31. struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  32. struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  33. acpi_status status;
  34. printk("calling mux switch %d\n", adapter);
  35. status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  36. &output);
  37. if (ACPI_FAILURE(status))
  38. return status;
  39. printk("mux switched %d\n", status);
  40. return 0;
  41. }
  42. EXPORT_SYMBOL_GPL(mxm_wmi_call_mxds);
  43. int mxm_wmi_call_mxmx(int adapter)
  44. {
  45. struct mxds_args args = {
  46. .func = MXM_WMMX_FUNC_MXMX,
  47. .args = 0,
  48. .xarg = 1,
  49. };
  50. struct acpi_buffer input = { (acpi_size)sizeof(args), &args };
  51. struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  52. acpi_status status;
  53. printk("calling mux switch %d\n", adapter);
  54. status = wmi_evaluate_method(MXM_WMMX_GUID, 0x0, adapter, &input,
  55. &output);
  56. if (ACPI_FAILURE(status))
  57. return status;
  58. printk("mux mutex set switched %d\n", status);
  59. return 0;
  60. }
  61. EXPORT_SYMBOL_GPL(mxm_wmi_call_mxmx);
  62. bool mxm_wmi_supported(void)
  63. {
  64. bool guid_valid;
  65. guid_valid = wmi_has_guid(MXM_WMMX_GUID);
  66. return guid_valid;
  67. }
  68. EXPORT_SYMBOL_GPL(mxm_wmi_supported);
  69. static int __init mxm_wmi_init(void)
  70. {
  71. return 0;
  72. }
  73. static void __exit mxm_wmi_exit(void)
  74. {
  75. }
  76. module_init(mxm_wmi_init);
  77. module_exit(mxm_wmi_exit);