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/*

 * Copyright 2008 Intel Corporation 

 * Copyright 2008 Red Hat 

 *

 * 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 

#include 

#include 

#include 

#include 

#include "i915_drv.h"

#include "intel_drv.h"

#define PCI_ASLE		0xe4

#define PCI_ASLS		0xfc

#define PCI_SWSCI		0xe8

#define PCI_SWSCI_SCISEL	(1 << 15)

#define PCI_SWSCI_GSSCIE	(1 << 0)

#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;

	u32 opregion_ver;

	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 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 ACPI_OTHER_OUTPUT (0<<8)

#define ACPI_VGA_OUTPUT (1<<8)

#define ACPI_TV_OUTPUT (2<<8)

#define ACPI_DIGITAL_OUTPUT (3<<8)

#define ACPI_LVDS_OUTPUT (4<<8)

#define MAX_DSLP	1500

#ifdef CONFIG_ACPI

static int swsci(struct drm_device *dev, u32 function, u32 parm, u32 *parm_out)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct opregion_swsci *swsci = dev_priv->opregion.swsci;

	u32 main_function, sub_function, scic;

	u16 pci_swsci;

	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_DEBUG_DRIVER("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(dev->pdev, PCI_SWSCI, &pci_swsci);

	if (!(pci_swsci & PCI_SWSCI_SCISEL) || (pci_swsci & PCI_SWSCI_GSSCIE)) {

		pci_swsci |= PCI_SWSCI_SCISEL;

		pci_swsci &= ~PCI_SWSCI_GSSCIE;

		pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);

	}

	/* Use event trigger to tell bios to check the mail. */

	pci_swsci |= PCI_SWSCI_GSSCIE;

	pci_write_config_word(dev->pdev, PCI_SWSCI, pci_swsci);

	/* Poll for the result. */

#define C (((scic = swsci->scic) & SWSCI_SCIC_INDICATOR) == 0)

	if (wait_for(C, dslp)) {

		DRM_DEBUG_DRIVER("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_DEBUG_DRIVER("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_device *dev = intel_encoder->base.dev;

	u32 parm = 0;

	u32 type = 0;

	u32 port;

	/* don't care about old stuff for now */

	if (!HAS_DDI(dev))

		return 0;

	if (intel_encoder->type == INTEL_OUTPUT_DSI)

		port = 0;

	else

		port = intel_ddi_get_encoder_port(intel_encoder);

	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_UNKNOWN:

	case INTEL_OUTPUT_DISPLAYPORT:

	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:

		WARN_ONCE(1, "unsupported intel_encoder type %d\n",

			  intel_encoder->type);

		return -EINVAL;

	}

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

	return swsci(dev, 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_device *dev, pci_power_t state)

{

	int i;

	if (!HAS_DDI(dev))

		return 0;

	for (i = 0; i < ARRAY_SIZE(power_state_map); i++) {

		if (state == power_state_map[i].pci_power_state)

			return swsci(dev, SWSCI_SBCB_ADAPTER_POWER_STATE,

				     power_state_map[i].parm, NULL);

	}

	return -EINVAL;

}

static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_connector *connector;

	struct opregion_asle *asle = dev_priv->opregion.asle;

	DRM_DEBUG_DRIVER("bclp = 0x%08x\n", bclp);

	if (acpi_video_get_backlight_type() == acpi_backlight_native) {

		DRM_DEBUG_KMS("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_DEBUG_KMS("updating opregion backlight %d/255\n", bclp);

	for_each_intel_connector(dev, connector)

		intel_panel_set_backlight_acpi(connector, bclp, 255);

	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_device *dev, 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_DEBUG_DRIVER("Illum is not supported\n");

	return ASLC_ALS_ILLUM_FAILED;

}

static u32 asle_set_pwm_freq(struct drm_device *dev, u32 pfmb)

{

	DRM_DEBUG_DRIVER("PWM freq is not supported\n");

	return ASLC_PWM_FREQ_FAILED;

}

static u32 asle_set_pfit(struct drm_device *dev, u32 pfit)

{

	/* Panel fitting is currently controlled by the X code, so this is a

	   noop until modesetting support works fully */

	DRM_DEBUG_DRIVER("Pfit is not supported\n");

	return ASLC_PFIT_FAILED;

}

static u32 asle_set_supported_rotation_angles(struct drm_device *dev, u32 srot)

{

	DRM_DEBUG_DRIVER("SROT is not supported\n");

	return ASLC_ROTATION_ANGLES_FAILED;

}

static u32 asle_set_button_array(struct drm_device *dev, u32 iuer)

{

	if (!iuer)

		DRM_DEBUG_DRIVER("Button array event is not supported (nothing)\n");

	if (iuer & ASLE_IUER_ROTATION_LOCK_BTN)

		DRM_DEBUG_DRIVER("Button array event is not supported (rotation lock)\n");

	if (iuer & ASLE_IUER_VOLUME_DOWN_BTN)

		DRM_DEBUG_DRIVER("Button array event is not supported (volume down)\n");

	if (iuer & ASLE_IUER_VOLUME_UP_BTN)

		DRM_DEBUG_DRIVER("Button array event is not supported (volume up)\n");

	if (iuer & ASLE_IUER_WINDOWS_BTN)

		DRM_DEBUG_DRIVER("Button array event is not supported (windows)\n");

	if (iuer & ASLE_IUER_POWER_BTN)

		DRM_DEBUG_DRIVER("Button array event is not supported (power)\n");

	return ASLC_BUTTON_ARRAY_FAILED;

}

static u32 asle_set_convertible(struct drm_device *dev, u32 iuer)

{

	if (iuer & ASLE_IUER_CONVERTIBLE)

		DRM_DEBUG_DRIVER("Convertible is not supported (clamshell)\n");

	else

		DRM_DEBUG_DRIVER("Convertible is not supported (slate)\n");

	return ASLC_CONVERTIBLE_FAILED;

}

static u32 asle_set_docking(struct drm_device *dev, u32 iuer)

{

	if (iuer & ASLE_IUER_DOCKING)

		DRM_DEBUG_DRIVER("Docking is not supported (docked)\n");

	else

		DRM_DEBUG_DRIVER("Docking is not supported (undocked)\n");

	return ASLC_DOCKING_FAILED;

}

static u32 asle_isct_state(struct drm_device *dev)

{

	DRM_DEBUG_DRIVER("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 drm_device *dev = dev_priv->dev;

	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_DEBUG_DRIVER("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, asle->alsi);

	if (aslc_req & ASLC_SET_BACKLIGHT)

		aslc_stat |= asle_set_backlight(dev, asle->bclp);

	if (aslc_req & ASLC_SET_PFIT)

		aslc_stat |= asle_set_pfit(dev, asle->pfit);

	if (aslc_req & ASLC_SET_PWM_FREQ)

		aslc_stat |= asle_set_pwm_freq(dev, asle->pfmb);

	if (aslc_req & ASLC_SUPPORTED_ROTATION_ANGLES)

		aslc_stat |= asle_set_supported_rotation_angles(dev,

							asle->srot);

	if (aslc_req & ASLC_BUTTON_ARRAY)

		aslc_stat |= asle_set_button_array(dev, asle->iuer);

	if (aslc_req & ASLC_CONVERTIBLE_INDICATOR)

		aslc_stat |= asle_set_convertible(dev, asle->iuer);

	if (aslc_req & ASLC_DOCKING_INDICATOR)

		aslc_stat |= asle_set_docking(dev, asle->iuer);

	if (aslc_req & ASLC_ISCT_STATE_CHANGE)

		aslc_stat |= asle_isct_state(dev);

	asle->aslc = aslc_stat;

}

void intel_opregion_asle_intr(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	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)

static struct intel_opregion *system_opregion;

static int intel_opregion_video_event(struct notifier_block *nb,

				      unsigned long val, void *data)

{

	/* 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.

	*/

	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;

	if (!system_opregion)

		return NOTIFY_DONE;

	acpi = system_opregion->acpi;

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

		ret = NOTIFY_BAD;

	acpi->csts = 0;

	return ret;

}

static struct notifier_block intel_opregion_notifier = {

	.notifier_call = intel_opregion_video_event,

};

/*

 * 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 u32 get_did(struct intel_opregion *opregion, int i)

{

	u32 did;

	if (i < ARRAY_SIZE(opregion->acpi->didl)) {

		did = opregion->acpi->didl[i];

	} else {

		i -= ARRAY_SIZE(opregion->acpi->didl);

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

			return 0;

		did = opregion->acpi->did2[i];

	}

	return did;

}

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_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_opregion *opregion = &dev_priv->opregion;

	struct drm_connector *connector;

	acpi_handle handle;

	struct acpi_device *acpi_dev, *acpi_cdev, *acpi_video_bus = NULL;

	unsigned long long device_id;

	acpi_status status;

	u32 temp, max_outputs;

	int i = 0;

	handle = ACPI_HANDLE(&dev->pdev->dev);

	if (!handle || acpi_bus_get_device(handle, &acpi_dev))

		return;

	if (acpi_is_video_device(handle))

		acpi_video_bus = acpi_dev;

	else {

		list_for_each_entry(acpi_cdev, &acpi_dev->children, node) {

			if (acpi_is_video_device(acpi_cdev->handle)) {

				acpi_video_bus = acpi_cdev;

				break;

			}

		}

	}

	if (!acpi_video_bus) {

		DRM_DEBUG_KMS("No ACPI video bus found\n");

		return;

	}

	/*

	 * 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);

	list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {

		if (i >= max_outputs) {

			DRM_DEBUG_KMS("More than %u outputs detected via ACPI\n",

				      max_outputs);

			return;

		}

		status = acpi_evaluate_integer(acpi_cdev->handle, "_ADR",

					       NULL, &device_id);

		if (ACPI_SUCCESS(status)) {

			if (!device_id)

				goto blind_set;

			set_did(opregion, i++, (u32)(device_id & 0x0f0f));

		}

	}

end:

	DRM_DEBUG_KMS("%d outputs detected\n", i);

	/* If fewer than max outputs, the list must be null terminated */

	if (i < max_outputs)

		set_did(opregion, i, 0);

	return;

blind_set:

	i = 0;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		int output_type = ACPI_OTHER_OUTPUT;

		if (i >= max_outputs) {

			DRM_DEBUG_KMS("More than %u outputs in connector list\n",

				      max_outputs);

			return;

		}

		switch (connector->connector_type) {

		case DRM_MODE_CONNECTOR_VGA:

		case DRM_MODE_CONNECTOR_DVIA:

			output_type = ACPI_VGA_OUTPUT;

			break;

		case DRM_MODE_CONNECTOR_Composite:

		case DRM_MODE_CONNECTOR_SVIDEO:

		case DRM_MODE_CONNECTOR_Component:

		case DRM_MODE_CONNECTOR_9PinDIN:

			output_type = ACPI_TV_OUTPUT;

			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:

			output_type = ACPI_DIGITAL_OUTPUT;

			break;

		case DRM_MODE_CONNECTOR_LVDS:

			output_type = ACPI_LVDS_OUTPUT;

			break;

		}

		temp = get_did(opregion, i);

		set_did(opregion, i, temp | (1 << 31) | output_type | i);

		i++;

	}

	goto end;

}

static void intel_setup_cadls(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_opregion *opregion = &dev_priv->opregion;

	int i = 0;

	u32 disp_id;

	/* Initialize the CADL field by duplicating the DIDL values.

	 * 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. Just like DIDL, CADL is NULL-terminated if

	 * there are less than eight devices. */

	do {

		disp_id = get_did(opregion, i);

		opregion->acpi->cadl[i] = disp_id;

	} while (++i < 8 && disp_id != 0);

}

void intel_opregion_init(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_opregion *opregion = &dev_priv->opregion;

	if (!opregion->header)

		return;

	if (opregion->acpi) {

		intel_didl_outputs(dev);

		intel_setup_cadls(dev);

		/* 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;

		system_opregion = opregion;

		register_acpi_notifier(&intel_opregion_notifier);

	}

	if (opregion->asle) {

		opregion->asle->tche = ASLE_TCHE_BLC_EN;

		opregion->asle->ardy = ASLE_ARDY_READY;

	}

}

void intel_opregion_fini(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_opregion *opregion = &dev_priv->opregion;

	if (!opregion->header)

		return;

	if (opregion->asle)

		opregion->asle->ardy = ASLE_ARDY_NOT_READY;

	cancel_work_sync(&dev_priv->opregion.asle_work);

	if (opregion->acpi) {

		opregion->acpi->drdy = 0;

		system_opregion = NULL;

		unregister_acpi_notifier(&intel_opregion_notifier);

	}

	/* just clear all opregion memory pointers now */

	memunmap(opregion->header);

	if (opregion->rvda) {

		memunmap(opregion->rvda);

		opregion->rvda = NULL;

	}

	opregion->header = NULL;

	opregion->acpi = NULL;

	opregion->swsci = NULL;

	opregion->asle = NULL;

	opregion->vbt = NULL;

	opregion->lid_state = NULL;

}

static void swsci_setup(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	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, 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, 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, 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_DEBUG_DRIVER("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_DEBUG_DRIVER("SWSCI GBDA callbacks %08x, SBCB callbacks %08x\n",

			 opregion->swsci_gbda_sub_functions,

			 opregion->swsci_sbcb_sub_functions);

}

#else /* CONFIG_ACPI */

static inline void swsci_setup(struct drm_device *dev) {}

#endif  /* CONFIG_ACPI */

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"),

		},

	},

	{ }

};

int intel_opregion_setup(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_opregion *opregion = &dev_priv->opregion;

	u32 asls, mboxes;

	char buf[sizeof(OPREGION_SIGNATURE)];

	int err = 0;

	void *base;

	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(dev->pdev, PCI_ASLS, &asls);

	DRM_DEBUG_DRIVER("graphic opregion physical addr: 0x%x\n", asls);

	if (asls == 0) {

		DRM_DEBUG_DRIVER("ACPI OpRegion not supported!\n");

		return -ENOTSUPP;

	}

#ifdef CONFIG_ACPI

	INIT_WORK(&opregion->asle_work, asle_work);

#endif

	base = memremap(asls, OPREGION_SIZE, MEMREMAP_WB);

	if (!base)

		return -ENOMEM;

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

	if (memcmp(buf, OPREGION_SIGNATURE, 16)) {

		DRM_DEBUG_DRIVER("opregion signature mismatch\n");

		err = -EINVAL;

		goto err_out;

	}

	opregion->header = base;

	opregion->lid_state = base + ACPI_CLID;

	mboxes = opregion->header->mboxes;

	if (mboxes & MBOX_ACPI) {

		DRM_DEBUG_DRIVER("Public ACPI methods supported\n");

		opregion->acpi = base + OPREGION_ACPI_OFFSET;

	}

	if (mboxes & MBOX_SWSCI) {

		DRM_DEBUG_DRIVER("SWSCI supported\n");

		opregion->swsci = base + OPREGION_SWSCI_OFFSET;

		swsci_setup(dev);

	}

	if (mboxes & MBOX_ASLE) {

		DRM_DEBUG_DRIVER("ASLE supported\n");

		opregion->asle = base + OPREGION_ASLE_OFFSET;

		opregion->asle->ardy = ASLE_ARDY_NOT_READY;

	}

	if (mboxes & MBOX_ASLE_EXT)

		DRM_DEBUG_DRIVER("ASLE extension supported\n");

	if (!dmi_check_system(intel_no_opregion_vbt)) {

		const void *vbt = NULL;

		u32 vbt_size = 0;

		if (opregion->header->opregion_ver >= 2 && opregion->asle &&

		    opregion->asle->rvda && opregion->asle->rvds) {

			opregion->rvda = memremap(opregion->asle->rvda,

						  opregion->asle->rvds,

						  MEMREMAP_WB);

			vbt = opregion->rvda;

			vbt_size = opregion->asle->rvds;

		}

		if (intel_bios_is_valid_vbt(vbt, vbt_size)) {

			DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (RVDA)\n");

			opregion->vbt = vbt;

			opregion->vbt_size = vbt_size;

		} else {

			vbt = base + OPREGION_VBT_OFFSET;

			vbt_size = OPREGION_ASLE_EXT_OFFSET - OPREGION_VBT_OFFSET;

			if (intel_bios_is_valid_vbt(vbt, vbt_size)) {

				DRM_DEBUG_KMS("Found valid VBT in ACPI OpRegion (Mailbox #4)\n");

				opregion->vbt = vbt;

				opregion->vbt_size = vbt_size;

			}

		}

	}

	return 0;

err_out:

	memunmap(base);

	return err;

}