/*
 * Copyright 2008 Intel Corporation <hong.liu@intel.com>
 * Copyright 2008 Red Hat <mjg@redhat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NON-INFRINGEMENT.  IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/firmware.h>
#include <acpi/video.h>

#include "display/intel_panel.h"

#include "i915_drv.h"
#include "intel_acpi.h"
#include "intel_display_types.h"
#include "intel_opregion.h"

#define OPREGION_HEADER_OFFSET 0
#define OPREGION_ACPI_OFFSET   0x100
#define   ACPI_CLID 0x01ac /* current lid state indicator */
#define   ACPI_CDCK 0x01b0 /* current docking state indicator */
#define OPREGION_SWSCI_OFFSET  0x200
#define OPREGION_ASLE_OFFSET   0x300
#define OPREGION_VBT_OFFSET    0x400
#define OPREGION_ASLE_EXT_OFFSET        0x1C00

#define OPREGION_SIGNATURE "IntelGraphicsMem"
#define MBOX_ACPI      (1<<0)
#define MBOX_SWSCI     (1<<1)
#define MBOX_ASLE      (1<<2)
#define MBOX_ASLE_EXT  (1<<4)

struct opregion_header {
        u8 signature[16];
        u32 size;
        struct {
                u8 rsvd;
                u8 revision;
                u8 minor;
                u8 major;
        }  __packed over;
        u8 bios_ver[32];
        u8 vbios_ver[16];
        u8 driver_ver[16];
        u32 mboxes;
        u32 driver_model;
        u32 pcon;
        u8 dver[32];
        u8 rsvd[124];
} __packed;

/* OpRegion mailbox #1: public ACPI methods */
struct opregion_acpi {
        u32 drdy;       /* driver readiness */
        u32 csts;       /* notification status */
        u32 cevt;       /* current event */
        u8 rsvd1[20];
        u32 didl[8];    /* supported display devices ID list */
        u32 cpdl[8];    /* currently presented display list */
        u32 cadl[8];    /* currently active display list */
        u32 nadl[8];    /* next active devices list */
        u32 aslp;       /* ASL sleep time-out */
        u32 tidx;       /* toggle table index */
        u32 chpd;       /* current hotplug enable indicator */
        u32 clid;       /* current lid state*/
        u32 cdck;       /* current docking state */
        u32 sxsw;       /* Sx state resume */
        u32 evts;       /* ASL supported events */
        u32 cnot;       /* current OS notification */
        u32 nrdy;       /* driver status */
        u32 did2[7];    /* extended supported display devices ID list */
        u32 cpd2[7];    /* extended attached display devices list */
        u8 rsvd2[4];
} __packed;

/* OpRegion mailbox #2: SWSCI */
struct opregion_swsci {
        u32 scic;       /* SWSCI command|status|data */
        u32 parm;       /* command parameters */
        u32 dslp;       /* driver sleep time-out */
        u8 rsvd[244];
} __packed;

/* OpRegion mailbox #3: ASLE */
struct opregion_asle {
        u32 ardy;       /* driver readiness */
        u32 aslc;       /* ASLE interrupt command */
        u32 tche;       /* technology enabled indicator */
        u32 alsi;       /* current ALS illuminance reading */
        u32 bclp;       /* backlight brightness to set */
        u32 pfit;       /* panel fitting state */
        u32 cblv;       /* current brightness level */
        u16 bclm[20];   /* backlight level duty cycle mapping table */
        u32 cpfm;       /* current panel fitting mode */
        u32 epfm;       /* enabled panel fitting modes */
        u8 plut[74];    /* panel LUT and identifier */
        u32 pfmb;       /* PWM freq and min brightness */
        u32 cddv;       /* color correction default values */
        u32 pcft;       /* power conservation features */
        u32 srot;       /* supported rotation angles */
        u32 iuer;       /* IUER events */
        u64 fdss;
        u32 fdsp;
        u32 stat;
        u64 rvda;       /* Physical (2.0) or relative from opregion (2.1+)
                         * address of raw VBT data. */
        u32 rvds;       /* Size of raw vbt data */
        u8 rsvd[58];
} __packed;

/* OpRegion mailbox #5: ASLE ext */
struct opregion_asle_ext {
        u32 phed;       /* Panel Header */
        u8 bddc[256];   /* Panel EDID */
        u8 rsvd[764];
} __packed;

/* Driver readiness indicator */
#define ASLE_ARDY_READY         (1 << 0)
#define ASLE_ARDY_NOT_READY     (0 << 0)

/* ASLE Interrupt Command (ASLC) bits */
#define ASLC_SET_ALS_ILLUM              (1 << 0)
#define ASLC_SET_BACKLIGHT              (1 << 1)
#define ASLC_SET_PFIT                   (1 << 2)
#define ASLC_SET_PWM_FREQ               (1 << 3)
#define ASLC_SUPPORTED_ROTATION_ANGLES  (1 << 4)
#define ASLC_BUTTON_ARRAY               (1 << 5)
#define ASLC_CONVERTIBLE_INDICATOR      (1 << 6)
#define ASLC_DOCKING_INDICATOR          (1 << 7)
#define ASLC_ISCT_STATE_CHANGE          (1 << 8)
#define ASLC_REQ_MSK                    0x1ff
/* response bits */
#define ASLC_ALS_ILLUM_FAILED           (1 << 10)
#define ASLC_BACKLIGHT_FAILED           (1 << 12)
#define ASLC_PFIT_FAILED                (1 << 14)
#define ASLC_PWM_FREQ_FAILED            (1 << 16)
#define ASLC_ROTATION_ANGLES_FAILED     (1 << 18)
#define ASLC_BUTTON_ARRAY_FAILED        (1 << 20)
#define ASLC_CONVERTIBLE_FAILED         (1 << 22)
#define ASLC_DOCKING_FAILED             (1 << 24)
#define ASLC_ISCT_STATE_FAILED          (1 << 26)

/* Technology enabled indicator */
#define ASLE_TCHE_ALS_EN        (1 << 0)
#define ASLE_TCHE_BLC_EN        (1 << 1)
#define ASLE_TCHE_PFIT_EN       (1 << 2)
#define ASLE_TCHE_PFMB_EN       (1 << 3)

/* ASLE backlight brightness to set */
#define ASLE_BCLP_VALID                (1<<31)
#define ASLE_BCLP_MSK          (~(1<<31))

/* ASLE panel fitting request */
#define ASLE_PFIT_VALID         (1<<31)
#define ASLE_PFIT_CENTER (1<<0)
#define ASLE_PFIT_STRETCH_TEXT (1<<1)
#define ASLE_PFIT_STRETCH_GFX (1<<2)

/* PWM frequency and minimum brightness */
#define ASLE_PFMB_BRIGHTNESS_MASK (0xff)
#define ASLE_PFMB_BRIGHTNESS_VALID (1<<8)
#define ASLE_PFMB_PWM_MASK (0x7ffffe00)
#define ASLE_PFMB_PWM_VALID (1<<31)

#define ASLE_CBLV_VALID         (1<<31)

/* IUER */
#define ASLE_IUER_DOCKING               (1 << 7)
#define ASLE_IUER_CONVERTIBLE           (1 << 6)
#define ASLE_IUER_ROTATION_LOCK_BTN     (1 << 4)
#define ASLE_IUER_VOLUME_DOWN_BTN       (1 << 3)
#define ASLE_IUER_VOLUME_UP_BTN         (1 << 2)
#define ASLE_IUER_WINDOWS_BTN           (1 << 1)
#define ASLE_IUER_POWER_BTN             (1 << 0)

/* Software System Control Interrupt (SWSCI) */
#define SWSCI_SCIC_INDICATOR            (1 << 0)
#define SWSCI_SCIC_MAIN_FUNCTION_SHIFT  1
#define SWSCI_SCIC_MAIN_FUNCTION_MASK   (0xf << 1)
#define SWSCI_SCIC_SUB_FUNCTION_SHIFT   8
#define SWSCI_SCIC_SUB_FUNCTION_MASK    (0xff << 8)
#define SWSCI_SCIC_EXIT_PARAMETER_SHIFT 8
#define SWSCI_SCIC_EXIT_PARAMETER_MASK  (0xff << 8)
#define SWSCI_SCIC_EXIT_STATUS_SHIFT    5
#define SWSCI_SCIC_EXIT_STATUS_MASK     (7 << 5)
#define SWSCI_SCIC_EXIT_STATUS_SUCCESS  1

#define SWSCI_FUNCTION_CODE(main, sub) \
        ((main) << SWSCI_SCIC_MAIN_FUNCTION_SHIFT | \
         (sub) << SWSCI_SCIC_SUB_FUNCTION_SHIFT)

/* SWSCI: Get BIOS Data (GBDA) */
#define SWSCI_GBDA                      4
#define SWSCI_GBDA_SUPPORTED_CALLS      SWSCI_FUNCTION_CODE(SWSCI_GBDA, 0)
#define SWSCI_GBDA_REQUESTED_CALLBACKS  SWSCI_FUNCTION_CODE(SWSCI_GBDA, 1)
#define SWSCI_GBDA_BOOT_DISPLAY_PREF    SWSCI_FUNCTION_CODE(SWSCI_GBDA, 4)
#define SWSCI_GBDA_PANEL_DETAILS        SWSCI_FUNCTION_CODE(SWSCI_GBDA, 5)
#define SWSCI_GBDA_TV_STANDARD          SWSCI_FUNCTION_CODE(SWSCI_GBDA, 6)
#define SWSCI_GBDA_INTERNAL_GRAPHICS    SWSCI_FUNCTION_CODE(SWSCI_GBDA, 7)
#define SWSCI_GBDA_SPREAD_SPECTRUM      SWSCI_FUNCTION_CODE(SWSCI_GBDA, 10)

/* SWSCI: System BIOS Callbacks (SBCB) */
#define SWSCI_SBCB                      6
#define SWSCI_SBCB_SUPPORTED_CALLBACKS  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 0)
#define SWSCI_SBCB_INIT_COMPLETION      SWSCI_FUNCTION_CODE(SWSCI_SBCB, 1)
#define SWSCI_SBCB_PRE_HIRES_SET_MODE   SWSCI_FUNCTION_CODE(SWSCI_SBCB, 3)
#define SWSCI_SBCB_POST_HIRES_SET_MODE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 4)
#define SWSCI_SBCB_DISPLAY_SWITCH       SWSCI_FUNCTION_CODE(SWSCI_SBCB, 5)
#define SWSCI_SBCB_SET_TV_FORMAT        SWSCI_FUNCTION_CODE(SWSCI_SBCB, 6)
#define SWSCI_SBCB_ADAPTER_POWER_STATE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 7)
#define SWSCI_SBCB_DISPLAY_POWER_STATE  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 8)
#define SWSCI_SBCB_SET_BOOT_DISPLAY     SWSCI_FUNCTION_CODE(SWSCI_SBCB, 9)
#define SWSCI_SBCB_SET_PANEL_DETAILS    SWSCI_FUNCTION_CODE(SWSCI_SBCB, 10)
#define SWSCI_SBCB_SET_INTERNAL_GFX     SWSCI_FUNCTION_CODE(SWSCI_SBCB, 11)
#define SWSCI_SBCB_POST_HIRES_TO_DOS_FS SWSCI_FUNCTION_CODE(SWSCI_SBCB, 16)
#define SWSCI_SBCB_SUSPEND_RESUME       SWSCI_FUNCTION_CODE(SWSCI_SBCB, 17)
#define SWSCI_SBCB_SET_SPREAD_SPECTRUM  SWSCI_FUNCTION_CODE(SWSCI_SBCB, 18)
#define SWSCI_SBCB_POST_VBE_PM          SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
#define SWSCI_SBCB_ENABLE_DISABLE_AUDIO SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)

#define MAX_DSLP        1500

static int swsci(struct drm_i915_private *dev_priv,
                 u32 function, u32 parm, u32 *parm_out)
{
        struct opregion_swsci *swsci = dev_priv->opregion.swsci;
        struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
        u32 main_function, sub_function, scic;
        u16 swsci_val;
        u32 dslp;

        if (!swsci)
                return -ENODEV;

        main_function = (function & SWSCI_SCIC_MAIN_FUNCTION_MASK) >>
                SWSCI_SCIC_MAIN_FUNCTION_SHIFT;
        sub_function = (function & SWSCI_SCIC_SUB_FUNCTION_MASK) >>
                SWSCI_SCIC_SUB_FUNCTION_SHIFT;

        /* Check if we can call the function. See swsci_setup for details. */
        if (main_function == SWSCI_SBCB) {
                if ((dev_priv->opregion.swsci_sbcb_sub_functions &
                     (1 << sub_function)) == 0)
                        return -EINVAL;
        } else if (main_function == SWSCI_GBDA) {
                if ((dev_priv->opregion.swsci_gbda_sub_functions &
                     (1 << sub_function)) == 0)
                        return -EINVAL;
        }

        /* Driver sleep timeout in ms. */
        dslp = swsci->dslp;
        if (!dslp) {
                /* The spec says 2ms should be the default, but it's too small
                 * for some machines. */
                dslp = 50;
        } else if (dslp > MAX_DSLP) {
                /* Hey bios, trust must be earned. */
                DRM_INFO_ONCE("ACPI BIOS requests an excessive sleep of %u ms, "
                              "using %u ms instead\n", dslp, MAX_DSLP);
                dslp = MAX_DSLP;
        }

        /* The spec tells us to do this, but we are the only user... */
        scic = swsci->scic;
        if (scic & SWSCI_SCIC_INDICATOR) {
                drm_dbg(&dev_priv->drm, "SWSCI request already in progress\n");
                return -EBUSY;
        }

        scic = function | SWSCI_SCIC_INDICATOR;

        swsci->parm = parm;
        swsci->scic = scic;

        /* Ensure SCI event is selected and event trigger is cleared. */
        pci_read_config_word(pdev, SWSCI, &swsci_val);
        if (!(swsci_val & SWSCI_SCISEL) || (swsci_val & SWSCI_GSSCIE)) {
                swsci_val |= SWSCI_SCISEL;
                swsci_val &= ~SWSCI_GSSCIE;
                pci_write_config_word(pdev, SWSCI, swsci_val);
        }

        /* Use event trigger to tell bios to check the mail. */
        swsci_val |= SWSCI_GSSCIE;
        pci_write_config_word(pdev, SWSCI, swsci_val);

        /* Poll for the result. */
#define C (((scic = swsci->scic) & SWSCI_SCIC_INDICATOR) == 0)
        if (wait_for(C, dslp)) {
                drm_dbg(&dev_priv->drm, "SWSCI request timed out\n");
                return -ETIMEDOUT;
        }

        scic = (scic & SWSCI_SCIC_EXIT_STATUS_MASK) >>
                SWSCI_SCIC_EXIT_STATUS_SHIFT;

        /* Note: scic == 0 is an error! */
        if (scic != SWSCI_SCIC_EXIT_STATUS_SUCCESS) {
                drm_dbg(&dev_priv->drm, "SWSCI request error %u\n", scic);
                return -EIO;
        }

        if (parm_out)
                *parm_out = swsci->parm;

        return 0;

#undef C
}

#define DISPLAY_TYPE_CRT                        0
#define DISPLAY_TYPE_TV                         1
#define DISPLAY_TYPE_EXTERNAL_FLAT_PANEL        2
#define DISPLAY_TYPE_INTERNAL_FLAT_PANEL        3

int intel_opregion_notify_encoder(struct intel_encoder *intel_encoder,
                                  bool enable)
{
        struct drm_i915_private *dev_priv = to_i915(intel_encoder->base.dev);
        u32 parm = 0;
        u32 type = 0;
        u32 port;

        /* don't care about old stuff for now */
        if (!HAS_DDI(dev_priv))
                return 0;

        if (intel_encoder->type == INTEL_OUTPUT_DSI)
                port = 0;
        else
                port = intel_encoder->port;

        if (port == PORT_E)  {
                port = 0;
        } else {
                parm |= 1 << port;
                port++;
        }

        if (!enable)
                parm |= 4 << 8;

        switch (intel_encoder->type) {
        case INTEL_OUTPUT_ANALOG:
                type = DISPLAY_TYPE_CRT;
                break;
        case INTEL_OUTPUT_DDI:
        case INTEL_OUTPUT_DP:
        case INTEL_OUTPUT_HDMI:
        case INTEL_OUTPUT_DP_MST:
                type = DISPLAY_TYPE_EXTERNAL_FLAT_PANEL;
                break;
        case INTEL_OUTPUT_EDP:
        case INTEL_OUTPUT_DSI:
                type = DISPLAY_TYPE_INTERNAL_FLAT_PANEL;
                break;
        default:
                drm_WARN_ONCE(&dev_priv->drm, 1,
                              "unsupported intel_encoder type %d\n",
                              intel_encoder->type);
                return -EINVAL;
        }

        parm |= type << (16 + port * 3);

        return swsci(dev_priv, SWSCI_SBCB_DISPLAY_POWER_STATE, parm, NULL);
}

static const struct {
        pci_power_t pci_power_state;
        u32 parm;
} power_state_map[] = {
        { PCI_D0,       0x00 },
        { PCI_D1,       0x01 },
        { PCI_D2,       0x02 },
        { PCI_D3hot,    0x04 },
        { PCI_D3cold,   0x04 },
};

int intel_opregion_notify_adapter(struct drm_i915_private *dev_priv,
                                  pci_power_t state)
{
        int i;

        if (!HAS_DDI(dev_priv))
                return 0;

        for (i = 0; i < ARRAY_SIZE(power_state_map); i++) {
                if (state == power_state_map[i].pci_power_state)
                        return swsci(dev_priv, SWSCI_SBCB_ADAPTER_POWER_STATE,
                                     power_state_map[i].parm, NULL);
        }

        return -EINVAL;
}

static u32 asle_set_backlight(struct drm_i915_private *dev_priv, u32 bclp)
{
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        struct opregion_asle *asle = dev_priv->opregion.asle;
        struct drm_device *dev = &dev_priv->drm;

        drm_dbg(&dev_priv->drm, "bclp = 0x%08x\n", bclp);

        if (acpi_video_get_backlight_type() == acpi_backlight_native) {
                drm_dbg_kms(&dev_priv->drm,
                            "opregion backlight request ignored\n");
                return 0;
        }

        if (!(bclp & ASLE_BCLP_VALID))
                return ASLC_BACKLIGHT_FAILED;

        bclp &= ASLE_BCLP_MSK;
        if (bclp > 255)
                return ASLC_BACKLIGHT_FAILED;

        drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);

        /*
         * Update backlight on all connectors that support backlight (usually
         * only one).
         */
        drm_dbg_kms(&dev_priv->drm, "updating opregion backlight %d/255\n",
                    bclp);
        drm_connector_list_iter_begin(dev, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter)
                intel_panel_set_backlight_acpi(connector->base.state, bclp, 255);
        drm_connector_list_iter_end(&conn_iter);
        asle->cblv = DIV_ROUND_UP(bclp * 100, 255) | ASLE_CBLV_VALID;

        drm_modeset_unlock(&dev->mode_config.connection_mutex);


        return 0;
}

static u32 asle_set_als_illum(struct drm_i915_private *dev_priv, u32 alsi)
{
        /* alsi is the current ALS reading in lux. 0 indicates below sensor
           range, 0xffff indicates above sensor range. 1-0xfffe are valid */
        drm_dbg(&dev_priv->drm, "Illum is not supported\n");
        return ASLC_ALS_ILLUM_FAILED;
}

static u32 asle_set_pwm_freq(struct drm_i915_private *dev_priv, u32 pfmb)
{
        drm_dbg(&dev_priv->drm, "PWM freq is not supported\n");
        return ASLC_PWM_FREQ_FAILED;
}

static u32 asle_set_pfit(struct drm_i915_private *dev_priv, u32 pfit)
{
        /* Panel fitting is currently controlled by the X code, so this is a
           noop until modesetting support works fully */
        drm_dbg(&dev_priv->drm, "Pfit is not supported\n");
        return ASLC_PFIT_FAILED;
}

static u32 asle_set_supported_rotation_angles(struct drm_i915_private *dev_priv, u32 srot)
{
        drm_dbg(&dev_priv->drm, "SROT is not supported\n");
        return ASLC_ROTATION_ANGLES_FAILED;
}

static u32 asle_set_button_array(struct drm_i915_private *dev_priv, u32 iuer)
{
        if (!iuer)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (nothing)\n");
        if (iuer & ASLE_IUER_ROTATION_LOCK_BTN)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (rotation lock)\n");
        if (iuer & ASLE_IUER_VOLUME_DOWN_BTN)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (volume down)\n");
        if (iuer & ASLE_IUER_VOLUME_UP_BTN)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (volume up)\n");
        if (iuer & ASLE_IUER_WINDOWS_BTN)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (windows)\n");
        if (iuer & ASLE_IUER_POWER_BTN)
                drm_dbg(&dev_priv->drm,
                        "Button array event is not supported (power)\n");

        return ASLC_BUTTON_ARRAY_FAILED;
}

static u32 asle_set_convertible(struct drm_i915_private *dev_priv, u32 iuer)
{
        if (iuer & ASLE_IUER_CONVERTIBLE)
                drm_dbg(&dev_priv->drm,
                        "Convertible is not supported (clamshell)\n");
        else
                drm_dbg(&dev_priv->drm,
                        "Convertible is not supported (slate)\n");

        return ASLC_CONVERTIBLE_FAILED;
}

static u32 asle_set_docking(struct drm_i915_private *dev_priv, u32 iuer)
{
        if (iuer & ASLE_IUER_DOCKING)
                drm_dbg(&dev_priv->drm, "Docking is not supported (docked)\n");
        else
                drm_dbg(&dev_priv->drm,
                        "Docking is not supported (undocked)\n");

        return ASLC_DOCKING_FAILED;
}

static u32 asle_isct_state(struct drm_i915_private *dev_priv)
{
        drm_dbg(&dev_priv->drm, "ISCT is not supported\n");
        return ASLC_ISCT_STATE_FAILED;
}

static void asle_work(struct work_struct *work)
{
        struct intel_opregion *opregion =
                container_of(work, struct intel_opregion, asle_work);
        struct drm_i915_private *dev_priv =
                container_of(opregion, struct drm_i915_private, opregion);
        struct opregion_asle *asle = dev_priv->opregion.asle;
        u32 aslc_stat = 0;
        u32 aslc_req;

        if (!asle)
                return;

        aslc_req = asle->aslc;

        if (!(aslc_req & ASLC_REQ_MSK)) {
                drm_dbg(&dev_priv->drm,
                        "No request on ASLC interrupt 0x%08x\n", aslc_req);
                return;
        }

        if (aslc_req & ASLC_SET_ALS_ILLUM)
                aslc_stat |= asle_set_als_illum(dev_priv, asle->alsi);

        if (aslc_req & ASLC_SET_BACKLIGHT)
                aslc_stat |= asle_set_backlight(dev_priv, asle->bclp);

        if (aslc_req & ASLC_SET_PFIT)
                aslc_stat |= asle_set_pfit(dev_priv, asle->pfit);

        if (aslc_req & ASLC_SET_PWM_FREQ)
                aslc_stat |= asle_set_pwm_freq(dev_priv, asle->pfmb);

        if (aslc_req & ASLC_SUPPORTED_ROTATION_ANGLES)
                aslc_stat |= asle_set_supported_rotation_angles(dev_priv,
                                                        asle->srot);

        if (aslc_req & ASLC_BUTTON_ARRAY)
                aslc_stat |= asle_set_button_array(dev_priv, asle->iuer);

        if (aslc_req & ASLC_CONVERTIBLE_INDICATOR)
                aslc_stat |= asle_set_convertible(dev_priv, asle->iuer);

        if (aslc_req & ASLC_DOCKING_INDICATOR)
                aslc_stat |= asle_set_docking(dev_priv, asle->iuer);

        if (aslc_req & ASLC_ISCT_STATE_CHANGE)
                aslc_stat |= asle_isct_state(dev_priv);

        asle->aslc = aslc_stat;
}

void intel_opregion_asle_intr(struct drm_i915_private *dev_priv)
{
        if (dev_priv->opregion.asle)
                schedule_work(&dev_priv->opregion.asle_work);
}

#define ACPI_EV_DISPLAY_SWITCH (1<<0)
#define ACPI_EV_LID            (1<<1)
#define ACPI_EV_DOCK           (1<<2)

/*
 * The only video events relevant to opregion are 0x80. These indicate either a
 * docking event, lid switch or display switch request. In Linux, these are
 * handled by the dock, button and video drivers.
 */
static int intel_opregion_video_event(struct notifier_block *nb,
                                      unsigned long val, void *data)
{
        struct intel_opregion *opregion = container_of(nb, struct intel_opregion,
                                                       acpi_notifier);
        struct acpi_bus_event *event = data;
        struct opregion_acpi *acpi;
        int ret = NOTIFY_OK;

        if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
                return NOTIFY_DONE;

        acpi = opregion->acpi;

        if (event->type == 0x80 && ((acpi->cevt & 1) == 0))
                ret = NOTIFY_BAD;

        acpi->csts = 0;

        return ret;
}

/*
 * Initialise the DIDL field in opregion. This passes a list of devices to
 * the firmware. Values are defined by section B.4.2 of the ACPI specification
 * (version 3)
 */

static void set_did(struct intel_opregion *opregion, int i, u32 val)
{
        if (i < ARRAY_SIZE(opregion->acpi->didl)) {
                opregion->acpi->didl[i] = val;
        } else {
                i -= ARRAY_SIZE(opregion->acpi->didl);

                if (WARN_ON(i >= ARRAY_SIZE(opregion->acpi->did2)))
                        return;

                opregion->acpi->did2[i] = val;
        }
}

static void intel_didl_outputs(struct drm_i915_private *dev_priv)
{
        struct intel_opregion *opregion = &dev_priv->opregion;
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        int i = 0, max_outputs;

        /*
         * In theory, did2, the extended didl, gets added at opregion version
         * 3.0. In practice, however, we're supposed to set it for earlier
         * versions as well, since a BIOS that doesn't understand did2 should
         * not look at it anyway. Use a variable so we can tweak this if a need
         * arises later.
         */
        max_outputs = ARRAY_SIZE(opregion->acpi->didl) +
                ARRAY_SIZE(opregion->acpi->did2);

        intel_acpi_device_id_update(dev_priv);

        drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (i < max_outputs)
                        set_did(opregion, i, connector->acpi_device_id);
                i++;
        }
        drm_connector_list_iter_end(&conn_iter);

        drm_dbg_kms(&dev_priv->drm, "%d outputs detected\n", i);

        if (i > max_outputs)
                drm_err(&dev_priv->drm,
                        "More than %d outputs in connector list\n",
                        max_outputs);

        /* If fewer than max outputs, the list must be null terminated */
        if (i < max_outputs)
                set_did(opregion, i, 0);
}

static void intel_setup_cadls(struct drm_i915_private *dev_priv)
{
        struct intel_opregion *opregion = &dev_priv->opregion;
        struct intel_connector *connector;
        struct drm_connector_list_iter conn_iter;
        int i = 0;

        /*
         * Initialize the CADL field from the connector device ids. This is
         * essentially the same as copying from the DIDL. Technically, this is
         * not always correct as display outputs may exist, but not active. This
         * initialization is necessary for some Clevo laptops that check this
         * field before processing the brightness and display switching hotkeys.
         *
         * Note that internal panels should be at the front of the connector
         * list already, ensuring they're not left out.
         */
        drm_connector_list_iter_begin(&dev_priv->drm, &conn_iter);
        for_each_intel_connector_iter(connector, &conn_iter) {
                if (i >= ARRAY_SIZE(opregion->acpi->cadl))
                        break;
                opregion->acpi->cadl[i++] = connector->acpi_device_id;
        }
        drm_connector_list_iter_end(&conn_iter);

        /* If fewer than 8 active devices, the list must be null terminated */
        if (i < ARRAY_SIZE(opregion->acpi->cadl))
                opregion->acpi->cadl[i] = 0;
}

static void swsci_setup(struct drm_i915_private *dev_priv)
{
        struct intel_opregion *opregion = &dev_priv->opregion;
        bool requested_callbacks = false;
        u32 tmp;

        /* Sub-function code 0 is okay, let's allow them. */
        opregion->swsci_gbda_sub_functions = 1;
        opregion->swsci_sbcb_sub_functions = 1;

        /* We use GBDA to ask for supported GBDA calls. */
        if (swsci(dev_priv, SWSCI_GBDA_SUPPORTED_CALLS, 0, &tmp) == 0) {
                /* make the bits match the sub-function codes */
                tmp <<= 1;
                opregion->swsci_gbda_sub_functions |= tmp;
        }

        /*
         * We also use GBDA to ask for _requested_ SBCB callbacks. The driver
         * must not call interfaces that are not specifically requested by the
         * bios.
         */
        if (swsci(dev_priv, SWSCI_GBDA_REQUESTED_CALLBACKS, 0, &tmp) == 0) {
                /* here, the bits already match sub-function codes */
                opregion->swsci_sbcb_sub_functions |= tmp;
                requested_callbacks = true;
        }

        /*
         * But we use SBCB to ask for _supported_ SBCB calls. This does not mean
         * the callback is _requested_. But we still can't call interfaces that
         * are not requested.
         */
        if (swsci(dev_priv, SWSCI_SBCB_SUPPORTED_CALLBACKS, 0, &tmp) == 0) {
                /* make the bits match the sub-function codes */
                u32 low = tmp & 0x7ff;
                u32 high = tmp & ~0xfff; /* bit 11 is reserved */
                tmp = (high << 4) | (low << 1) | 1;

                /* best guess what to do with supported wrt requested */
                if (requested_callbacks) {
                        u32 req = opregion->swsci_sbcb_sub_functions;
                        if ((req & tmp) != req)
                                drm_dbg(&dev_priv->drm,
                                        "SWSCI BIOS requested (%08x) SBCB callbacks that are not supported (%08x)\n",
                                        req, tmp);
                        /* XXX: for now, trust the requested callbacks */
                        /* opregion->swsci_sbcb_sub_functions &= tmp; */
                } else {
                        opregion->swsci_sbcb_sub_functions |= tmp;
                }
        }

        drm_dbg(&dev_priv->drm,
                "SWSCI GBDA callbacks %08x, SBCB callbacks %08x\n",
                opregion->swsci_gbda_sub_functions,
                opregion->swsci_sbcb_sub_functions);
}

static int intel_no_opregion_vbt_callback(const struct dmi_system_id *id)
{
        DRM_DEBUG_KMS("Falling back to manually reading VBT from "
                      "VBIOS ROM for %s\n", id->ident);
        return 1;
}

static const struct dmi_system_id intel_no_opregion_vbt[] = {
        {
                .callback = intel_no_opregion_vbt_callback,
                .ident = "ThinkCentre A57",
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "97027RG"),
                },
        },
        { }
};

static int intel_load_vbt_firmware(struct drm_i915_private *dev_priv)
{
        struct intel_opregion *opregion = &dev_priv->opregion;
        const struct firmware *fw = NULL;
        const char *name = dev_priv->params.vbt_firmware;
        int ret;

        if (!name || !*name)
                return -ENOENT;

        ret = request_firmware(&fw, name, dev_priv->drm.dev);
        if (ret) {
                drm_err(&dev_priv->drm,
                        "Requesting VBT firmware \"%s\" failed (%d)\n",
                        name, ret);
                return ret;
        }

        if (intel_bios_is_valid_vbt(fw->data, fw->size)) {
                opregion->vbt_firmware = kmemdup(fw->data, fw->size, GFP_KERNEL);
                if (opregion->vbt_firmware) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Found valid VBT firmware \"%s\"\n", name);
                        opregion->vbt = opregion->vbt_firmware;
                        opregion->vbt_size = fw->size;
                        ret = 0;
                } else {
                        ret = -ENOMEM;
                }
        } else {
                drm_dbg_kms(&dev_priv->drm, "Invalid VBT firmware \"%s\"\n",
                            name);
                ret = -EINVAL;
        }

        release_firmware(fw);

        return ret;
}

int intel_opregion_setup(struct drm_i915_private *dev_priv)
{
        struct intel_opregion *opregion = &dev_priv->opregion;
        struct pci_dev *pdev = to_pci_dev(dev_priv->drm.dev);
        u32 asls, mboxes;
        char buf[sizeof(OPREGION_SIGNATURE)];
        int err = 0;
        void *base;
        const void *vbt;
        u32 vbt_size;

        BUILD_BUG_ON(sizeof(struct opregion_header) != 0x100);
        BUILD_BUG_ON(sizeof(struct opregion_acpi) != 0x100);
        BUILD_BUG_ON(sizeof(struct opregion_swsci) != 0x100);
        BUILD_BUG_ON(sizeof(struct opregion_asle) != 0x100);
        BUILD_BUG_ON(sizeof(struct opregion_asle_ext) != 0x400);

        pci_read_config_dword(pdev, ASLS, &asls);
        drm_dbg(&dev_priv->drm, "graphic opregion physical addr: 0x%x\n",
                asls);
        if (asls == 0) {
                drm_dbg(&dev_priv->drm, "ACPI OpRegion not supported!\n");
                return -ENOTSUPP;
        }

        INIT_WORK(&opregion->asle_work, asle_work);

        base = memremap(asls, OPREGION_SIZE, MEMREMAP_WB);
        if (!base)
                return -ENOMEM;

        memcpy(buf, base, sizeof(buf));

        if (memcmp(buf, OPREGION_SIGNATURE, 16)) {
                drm_dbg(&dev_priv->drm, "opregion signature mismatch\n");
                err = -EINVAL;
                goto err_out;
        }
        opregion->header = base;
        opregion->lid_state = base + ACPI_CLID;

        drm_dbg(&dev_priv->drm, "ACPI OpRegion version %u.%u.%u\n",
                opregion->header->over.major,
                opregion->header->over.minor,
                opregion->header->over.revision);

        mboxes = opregion->header->mboxes;
        if (mboxes & MBOX_ACPI) {
                drm_dbg(&dev_priv->drm, "Public ACPI methods supported\n");
                opregion->acpi = base + OPREGION_ACPI_OFFSET;
                /*
                 * Indicate we handle monitor hotplug events ourselves so we do
                 * not need ACPI notifications for them. Disabling these avoids
                 * triggering the AML code doing the notifation, which may be
                 * broken as Windows also seems to disable these.
                 */
                opregion->acpi->chpd = 1;
        }

        if (mboxes & MBOX_SWSCI) {
                drm_dbg(&dev_priv->drm, "SWSCI supported\n");
                opregion->swsci = base + OPREGION_SWSCI_OFFSET;
                swsci_setup(dev_priv);
        }

        if (mboxes & MBOX_ASLE) {
                drm_dbg(&dev_priv->drm, "ASLE supported\n");
                opregion->asle = base + OPREGION_ASLE_OFFSET;

                opregion->asle->ardy = ASLE_ARDY_NOT_READY;
        }

        if (mboxes & MBOX_ASLE_EXT)
                drm_dbg(&dev_priv->drm, "ASLE extension supported\n");

        if (intel_load_vbt_firmware(dev_priv) == 0)
                goto out;

        if (dmi_check_system(intel_no_opregion_vbt))
                goto out;

        if (opregion->header->over.major >= 2 && opregion->asle &&
            opregion->asle->rvda && opregion->asle->rvds) {
                resource_size_t rvda = opregion->asle->rvda;

                /*
                 * opregion 2.0: rvda is the physical VBT address.
                 *
                 * opregion 2.1+: rvda is unsigned, relative offset from
                 * opregion base, and should never point within opregion.
                 */
                if (opregion->header->over.major > 2 ||
                    opregion->header->over.minor >= 1) {
                        drm_WARN_ON(&dev_priv->drm, rvda < OPREGION_SIZE);

                        rvda += asls;
                }

                opregion->rvda = memremap(rvda, opregion->asle->rvds,
                                          MEMREMAP_WB);

                vbt = opregion->rvda;
                vbt_size = opregion->asle->rvds;
                if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Found valid VBT in ACPI OpRegion (RVDA)\n");
                        opregion->vbt = vbt;
                        opregion->vbt_size = vbt_size;
                        goto out;
                } else {
                        drm_dbg_kms(&dev_priv->drm,
                                    "Invalid VBT in ACPI OpRegion (RVDA)\n");
                        memunmap(opregion->rvda);
                        opregion->rvda = NULL;
                }
        }

        vbt = base + OPREGION_VBT_OFFSET;
        /*
         * The VBT specification says that if the ASLE ext mailbox is not used
         * its area is reserved, but on some CHT boards the VBT extends into the
         * ASLE ext area. Allow this even though it is against the spec, so we
         * do not end up rejecting the VBT on those boards (and end up not
         * finding the LCD panel because of this).
         */
        vbt_size = (mboxes & MBOX_ASLE_EXT) ?
                OPREGION_ASLE_EXT_OFFSET : OPREGION_SIZE;
        vbt_size -= OPREGION_VBT_OFFSET;
        if (intel_bios_is_valid_vbt(vbt, vbt_size)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Found valid VBT in ACPI OpRegion (Mailbox #4)\n");
                opregion->vbt = vbt;
                opregion->vbt_size = vbt_size;
        } else {
                drm_dbg_kms(&dev_priv->drm,
                            "Invalid VBT in ACPI OpRegion (Mailbox #4)\n");
        }

out:
        return 0;

err_out:
        memunmap(base);
        return err;
}

static int intel_use_opregion_panel_type_callback(const struct dmi_system_id *id)
{
        DRM_INFO("Using panel type from OpRegion on %s\n", id->ident);
        return 1;
}

static const struct dmi_system_id intel_use_opregion_panel_type[] = {
        {
                .callback = intel_use_opregion_panel_type_callback,
                .ident = "Conrac GmbH IX45GM2",
                .matches = {DMI_MATCH(DMI_SYS_VENDOR, "Conrac GmbH"),
                            DMI_MATCH(DMI_PRODUCT_NAME, "IX45GM2"),
                },
        },
        { }

};

int
intel_opregion_get_panel_type(struct drm_i915_private *dev_priv)
{
        u32 panel_details;
        int ret;

        ret = swsci(dev_priv, SWSCI_GBDA_PANEL_DETAILS, 0x0, &panel_details);
        if (ret)
                return ret;

        ret = (panel_details >> 8) & 0xff;
        if (ret > 0x10) {
                drm_dbg_kms(&dev_priv->drm,
                            "Invalid OpRegion panel type 0x%x\n", ret);
                return -EINVAL;
        }

        /* fall back to VBT panel type? */
        if (ret == 0x0) {
                drm_dbg_kms(&dev_priv->drm, "No panel type in OpRegion\n");
                return -ENODEV;
        }

        /*
         * So far we know that some machined must use it, others must not use it.
         * There doesn't seem to be any way to determine which way to go, except
         * via a quirk list :(
         */
        if (!dmi_check_system(intel_use_opregion_panel_type)) {
                drm_dbg_kms(&dev_priv->drm,
                            "Ignoring OpRegion panel type (%d)\n", ret - 1);
                return -ENODEV;
        }

        return ret - 1;
}

void intel_opregion_register(struct drm_i915_private *i915)
{
        struct intel_opregion *opregion = &i915->opregion;

        if (!opregion->header)
                return;

        if (opregion->acpi) {
                opregion->acpi_notifier.notifier_call =
                        intel_opregion_video_event;
                register_acpi_notifier(&opregion->acpi_notifier);
        }

        intel_opregion_resume(i915);
}

void intel_opregion_resume(struct drm_i915_private *i915)
{
        struct intel_opregion *opregion = &i915->opregion;

        if (!opregion->header)
                return;

        if (opregion->acpi) {
                intel_didl_outputs(i915);
                intel_setup_cadls(i915);

                /*
                 * Notify BIOS we are ready to handle ACPI video ext notifs.
                 * Right now, all the events are handled by the ACPI video
                 * module. We don't actually need to do anything with them.
                 */
                opregion->acpi->csts = 0;
                opregion->acpi->drdy = 1;
        }

        if (opregion->asle) {
                opregion->asle->tche = ASLE_TCHE_BLC_EN;
                opregion->asle->ardy = ASLE_ARDY_READY;
        }

        /* Some platforms abuse the _DSM to enable MUX */
        intel_dsm_get_bios_data_funcs_supported(i915);

        intel_opregion_notify_adapter(i915, PCI_D0);
}

void intel_opregion_suspend(struct drm_i915_private *i915, pci_power_t state)
{
        struct intel_opregion *opregion = &i915->opregion;

        if (!opregion->header)
                return;

        intel_opregion_notify_adapter(i915, state);

        if (opregion->asle)
                opregion->asle->ardy = ASLE_ARDY_NOT_READY;

        cancel_work_sync(&i915->opregion.asle_work);

        if (opregion->acpi)
                opregion->acpi->drdy = 0;
}

void intel_opregion_unregister(struct drm_i915_private *i915)
{
        struct intel_opregion *opregion = &i915->opregion;

        intel_opregion_suspend(i915, PCI_D1);

        if (!opregion->header)
                return;

        if (opregion->acpi_notifier.notifier_call) {
                unregister_acpi_notifier(&opregion->acpi_notifier);
                opregion->acpi_notifier.notifier_call = NULL;
        }

        /* just clear all opregion memory pointers now */
        memunmap(opregion->header);
        if (opregion->rvda) {
                memunmap(opregion->rvda);
                opregion->rvda = NULL;
        }
        if (opregion->vbt_firmware) {
                kfree(opregion->vbt_firmware);
                opregion->vbt_firmware = NULL;
        }
        opregion->header = NULL;
        opregion->acpi = NULL;
        opregion->swsci = NULL;
        opregion->asle = NULL;
        opregion->vbt = NULL;
        opregion->lid_state = NULL;
}