// SPDX-License-Identifier: GPL-2.0
/*
 * Intel ACPI functions
 *
 * _DSM related code stolen from nouveau_acpi.c.
 */

#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/video.h>

#include <drm/drm_print.h>

#include "intel_acpi.h"
#include "intel_display_core.h"
#include "intel_display_types.h"
#include "intel_display_utils.h"

#define INTEL_DSM_REVISION_ID 1 /* For Calpella anyway... */
#define INTEL_DSM_FN_PLATFORM_MUX_INFO 1 /* No args */

static const guid_t intel_dsm_guid =
        GUID_INIT(0x7ed873d3, 0xc2d0, 0x4e4f,
                  0xa8, 0x54, 0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c);

#define INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED 0 /* No args */

static const guid_t intel_dsm_guid2 =
        GUID_INIT(0x3e5b41c6, 0xeb1d, 0x4260,
                  0x9d, 0x15, 0xc7, 0x1f, 0xba, 0xda, 0xe4, 0x14);

static char *intel_dsm_port_name(u8 id)
{
        switch (id) {
        case 0:
                return "Reserved";
        case 1:
                return "Analog VGA";
        case 2:
                return "LVDS";
        case 3:
                return "Reserved";
        case 4:
                return "HDMI/DVI_B";
        case 5:
                return "HDMI/DVI_C";
        case 6:
                return "HDMI/DVI_D";
        case 7:
                return "DisplayPort_A";
        case 8:
                return "DisplayPort_B";
        case 9:
                return "DisplayPort_C";
        case 0xa:
                return "DisplayPort_D";
        case 0xb:
        case 0xc:
        case 0xd:
                return "Reserved";
        case 0xe:
                return "WiDi";
        default:
                return "bad type";
        }
}

static char *intel_dsm_mux_type(u8 type)
{
        switch (type) {
        case 0:
                return "unknown";
        case 1:
                return "No MUX, iGPU only";
        case 2:
                return "No MUX, dGPU only";
        case 3:
                return "MUXed between iGPU and dGPU";
        default:
                return "bad type";
        }
}

static void intel_dsm_platform_mux_info(acpi_handle dhandle)
{
        int i;
        union acpi_object *pkg, *connector_count;

        pkg = acpi_evaluate_dsm_typed(dhandle, &intel_dsm_guid,
                        INTEL_DSM_REVISION_ID, INTEL_DSM_FN_PLATFORM_MUX_INFO,
                        NULL, ACPI_TYPE_PACKAGE);
        if (!pkg) {
                DRM_DEBUG_DRIVER("failed to evaluate _DSM\n");
                return;
        }

        if (!pkg->package.count) {
                DRM_DEBUG_DRIVER("no connection in _DSM\n");
                ACPI_FREE(pkg);
                return;
        }

        connector_count = &pkg->package.elements[0];
        DRM_DEBUG_DRIVER("MUX info connectors: %lld\n",
                  (unsigned long long)connector_count->integer.value);
        for (i = 1; i < pkg->package.count; i++) {
                union acpi_object *obj = &pkg->package.elements[i];
                union acpi_object *connector_id;
                union acpi_object *info;

                if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
                        DRM_DEBUG_DRIVER("Invalid object for MUX #%d\n", i);
                        continue;
                }

                connector_id = &obj->package.elements[0];
                info = &obj->package.elements[1];
                if (info->type != ACPI_TYPE_BUFFER || info->buffer.length < 4) {
                        DRM_DEBUG_DRIVER("Invalid info for MUX obj #%d\n", i);
                        continue;
                }

                DRM_DEBUG_DRIVER("Connector id: 0x%016llx\n",
                          (unsigned long long)connector_id->integer.value);
                DRM_DEBUG_DRIVER("  port id: %s\n",
                       intel_dsm_port_name(info->buffer.pointer[0]));
                DRM_DEBUG_DRIVER("  display mux info: %s\n",
                       intel_dsm_mux_type(info->buffer.pointer[1]));
                DRM_DEBUG_DRIVER("  aux/dc mux info: %s\n",
                       intel_dsm_mux_type(info->buffer.pointer[2]));
                DRM_DEBUG_DRIVER("  hpd mux info: %s\n",
                       intel_dsm_mux_type(info->buffer.pointer[3]));
        }

        ACPI_FREE(pkg);
}

static acpi_handle intel_dsm_pci_probe(struct pci_dev *pdev)
{
        acpi_handle dhandle;

        dhandle = ACPI_HANDLE(&pdev->dev);
        if (!dhandle)
                return NULL;

        if (!acpi_check_dsm(dhandle, &intel_dsm_guid, INTEL_DSM_REVISION_ID,
                            1 << INTEL_DSM_FN_PLATFORM_MUX_INFO)) {
                DRM_DEBUG_KMS("no _DSM method for intel device\n");
                return NULL;
        }

        intel_dsm_platform_mux_info(dhandle);

        return dhandle;
}

static bool intel_dsm_detect(void)
{
        acpi_handle dhandle = NULL;
        char acpi_method_name[255] = {};
        struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
        struct pci_dev *pdev = NULL;
        int vga_count = 0;

        while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
                vga_count++;
                dhandle = intel_dsm_pci_probe(pdev) ?: dhandle;
        }

        if (vga_count == 2 && dhandle) {
                acpi_get_name(dhandle, ACPI_FULL_PATHNAME, &buffer);
                DRM_DEBUG_DRIVER("vga_switcheroo: detected DSM switching method %s handle\n",
                                 acpi_method_name);
                return true;
        }

        return false;
}

void intel_register_dsm_handler(void)
{
        if (!intel_dsm_detect())
                return;
}

void intel_unregister_dsm_handler(void)
{
}

void intel_dsm_get_bios_data_funcs_supported(struct intel_display *display)
{
        struct pci_dev *pdev = to_pci_dev(display->drm->dev);
        acpi_handle dhandle;
        union acpi_object *obj;

        dhandle = ACPI_HANDLE(&pdev->dev);
        if (!dhandle)
                return;

        obj = acpi_evaluate_dsm(dhandle, &intel_dsm_guid2, INTEL_DSM_REVISION_ID,
                                INTEL_DSM_FN_GET_BIOS_DATA_FUNCS_SUPPORTED, NULL);
        if (obj)
                ACPI_FREE(obj);
}

/*
 * ACPI Specification, Revision 5.0, Appendix B.3.2 _DOD (Enumerate All Devices
 * Attached to the Display Adapter).
 */
#define ACPI_DISPLAY_INDEX_SHIFT                0
#define ACPI_DISPLAY_INDEX_MASK                 (0xf << 0)
#define ACPI_DISPLAY_PORT_ATTACHMENT_SHIFT      4
#define ACPI_DISPLAY_PORT_ATTACHMENT_MASK       (0xf << 4)
#define ACPI_DISPLAY_TYPE_SHIFT                 8
#define ACPI_DISPLAY_TYPE_MASK                  (0xf << 8)
#define ACPI_DISPLAY_TYPE_OTHER                 (0 << 8)
#define ACPI_DISPLAY_TYPE_VGA                   (1 << 8)
#define ACPI_DISPLAY_TYPE_TV                    (2 << 8)
#define ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL      (3 << 8)
#define ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL      (4 << 8)
#define ACPI_VENDOR_SPECIFIC_SHIFT              12
#define ACPI_VENDOR_SPECIFIC_MASK               (0xf << 12)
#define ACPI_BIOS_CAN_DETECT                    (1 << 16)
#define ACPI_DEPENDS_ON_VGA                     (1 << 17)
#define ACPI_PIPE_ID_SHIFT                      18
#define ACPI_PIPE_ID_MASK                       (7 << 18)
#define ACPI_DEVICE_ID_SCHEME                   (1ULL << 31)

static u32 acpi_display_type(struct intel_connector *connector)
{
        u32 display_type;

        switch (connector->base.connector_type) {
        case DRM_MODE_CONNECTOR_VGA:
        case DRM_MODE_CONNECTOR_DVIA:
                display_type = ACPI_DISPLAY_TYPE_VGA;
                break;
        case DRM_MODE_CONNECTOR_Composite:
        case DRM_MODE_CONNECTOR_SVIDEO:
        case DRM_MODE_CONNECTOR_Component:
        case DRM_MODE_CONNECTOR_9PinDIN:
        case DRM_MODE_CONNECTOR_TV:
                display_type = ACPI_DISPLAY_TYPE_TV;
                break;
        case DRM_MODE_CONNECTOR_DVII:
        case DRM_MODE_CONNECTOR_DVID:
        case DRM_MODE_CONNECTOR_DisplayPort:
        case DRM_MODE_CONNECTOR_HDMIA:
        case DRM_MODE_CONNECTOR_HDMIB:
                display_type = ACPI_DISPLAY_TYPE_EXTERNAL_DIGITAL;
                break;
        case DRM_MODE_CONNECTOR_LVDS:
        case DRM_MODE_CONNECTOR_eDP:
        case DRM_MODE_CONNECTOR_DSI:
                display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
                break;
        case DRM_MODE_CONNECTOR_Unknown:
        case DRM_MODE_CONNECTOR_VIRTUAL:
                display_type = ACPI_DISPLAY_TYPE_OTHER;
                break;
        default:
                MISSING_CASE(connector->base.connector_type);
                display_type = ACPI_DISPLAY_TYPE_OTHER;
                break;
        }

        return display_type;
}

void intel_acpi_device_id_update(struct intel_display *display)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        u8 display_index[16] = {};

        /* Populate the ACPI IDs for all connectors for a given drm_device */
        drm_connector_list_iter_begin(display->drm, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                u32 device_id, type;

                device_id = acpi_display_type(connector);

                /* Use display type specific display index. */
                type = (device_id & ACPI_DISPLAY_TYPE_MASK)
                        >> ACPI_DISPLAY_TYPE_SHIFT;
                device_id |= display_index[type]++ << ACPI_DISPLAY_INDEX_SHIFT;

                connector->acpi_device_id = device_id;
        }
        drm_connector_list_iter_end(&conn_iter);
}

/* NOTE: The connector order must be final before this is called. */
void intel_acpi_assign_connector_fwnodes(struct intel_display *display)
{
        struct drm_device *drm_dev = display->drm;
        struct drm_connector_list_iter conn_iter;
        struct fwnode_handle *fwnode = NULL;
        struct drm_connector *connector;
        struct acpi_device *adev;

        drm_connector_list_iter_begin(drm_dev, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                /* Always getting the next, even when the last was not used. */
                fwnode = device_get_next_child_node(drm_dev->dev, fwnode);
                if (!fwnode)
                        break;

                switch (connector->connector_type) {
                case DRM_MODE_CONNECTOR_LVDS:
                case DRM_MODE_CONNECTOR_eDP:
                case DRM_MODE_CONNECTOR_DSI:
                        /*
                         * Integrated displays have a specific address 0x1f on
                         * most Intel platforms, but not on all of them.
                         */
                        adev = acpi_find_child_device(ACPI_COMPANION(drm_dev->dev),
                                                      0x1f, 0);
                        if (adev) {
                                connector->fwnode =
                                        fwnode_handle_get(acpi_fwnode_handle(adev));
                                break;
                        }
                        fallthrough;
                default:
                        connector->fwnode = fwnode_handle_get(fwnode);
                        break;
                }
        }
        drm_connector_list_iter_end(&conn_iter);
        /*
         * device_get_next_child_node() takes a reference on the fwnode, if
         * we stopped iterating because we are out of connectors we need to
         * put this, otherwise fwnode is NULL and the put is a no-op.
         */
        fwnode_handle_put(fwnode);
}

void intel_acpi_video_register(struct intel_display *display)
{
        struct drm_connector_list_iter conn_iter;
        struct drm_connector *connector;

        acpi_video_register();

        /*
         * If i915 is driving an internal panel without registering its native
         * backlight handler try to register the acpi_video backlight.
         * For panels not driven by i915 another GPU driver may still register
         * a native backlight later and acpi_video_register_backlight() should
         * only be called after any native backlights have been registered.
         */
        drm_connector_list_iter_begin(display->drm, &conn_iter);
        drm_for_each_connector_iter(connector, &conn_iter) {
                struct intel_panel *panel = &to_intel_connector(connector)->panel;

                if (panel->backlight.funcs && !panel->backlight.device) {
                        acpi_video_register_backlight();
                        break;
                }
        }
        drm_connector_list_iter_end(&conn_iter);
}