drivers/gpu/drm/i915/intel_opregion.c - arm/linux-arm-legacy - Git at Google

 /*
  * 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.
  *
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

 #include <drm/drmP.h>
 #include <drm/i915_drm.h>
 #include "i915_drv.h"
 #include "intel_drv.h"

 #define PCI_ASLE 0xe4
 #define PCI_ASLS 0xfc

 #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_SIGNATURE "IntelGraphicsMem"
 #define MBOX_ACPI      (1<<0)
 #define MBOX_SWSCI     (1<<1)
 #define MBOX_ASLE      (1<<2)

 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;
 	u8 reserved[164];
 } __attribute__((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 */
 	u8 rsvd2[60];
 } __attribute__((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];
 } __attribute__((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 */
 	u8 rsvd[102];
 } __attribute__((packed));

 /* ASLE irq request bits */
 #define ASLE_SET_ALS_ILLUM     (1 << 0)
 #define ASLE_SET_BACKLIGHT     (1 << 1)
 #define ASLE_SET_PFIT          (1 << 2)
 #define ASLE_SET_PWM_FREQ      (1 << 3)
 #define ASLE_REQ_MSK           0xf

 /* response bits of ASLE irq request */
 #define ASLE_ALS_ILLUM_FAILED	(1<<10)
 #define ASLE_BACKLIGHT_FAILED	(1<<12)
 #define ASLE_PFIT_FAILED	(1<<14)
 #define ASLE_PWM_FREQ_FAILED	(1<<16)

 /* 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)

 #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)

 #ifdef CONFIG_ACPI
 static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
 	u32 max;

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

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

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

 	max = intel_panel_get_max_backlight(dev);
 	intel_panel_set_backlight(dev, bclp * max / 255);
 	iowrite32((bclp*0x64)/0xff | ASLE_CBLV_VALID, &asle->cblv);

 	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 */
 	return 0;
 }

 static u32 asle_set_pwm_freq(struct drm_device *dev, u32 pfmb)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	if (pfmb & ASLE_PFMB_PWM_VALID) {
 		u32 blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
 		u32 pwm = pfmb & ASLE_PFMB_PWM_MASK;
 		blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
 		pwm = pwm >> 9;
 		/* FIXME - what do we do with the PWM? */
 	}
 	return 0;
 }

 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 */
 	if (!(pfit & ASLE_PFIT_VALID))
 		return ASLE_PFIT_FAILED;
 	return 0;
 }

 void intel_opregion_asle_intr(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
 	u32 asle_stat = 0;
 	u32 asle_req;

 	if (!asle)
 		return;

 	asle_req = ioread32(&asle->aslc) & ASLE_REQ_MSK;

 	if (!asle_req) {
 		DRM_DEBUG_DRIVER("non asle set request??\n");
 		return;
 	}

 	if (asle_req & ASLE_SET_ALS_ILLUM)
 		asle_stat |= asle_set_als_illum(dev, ioread32(&asle->alsi));

 	if (asle_req & ASLE_SET_BACKLIGHT)
 		asle_stat |= asle_set_backlight(dev, ioread32(&asle->bclp));

 	if (asle_req & ASLE_SET_PFIT)
 		asle_stat |= asle_set_pfit(dev, ioread32(&asle->pfit));

 	if (asle_req & ASLE_SET_PWM_FREQ)
 		asle_stat |= asle_set_pwm_freq(dev, ioread32(&asle->pfmb));

 	iowrite32(asle_stat, &asle->aslc);
 }

 void intel_opregion_gse_intr(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
 	u32 asle_stat = 0;
 	u32 asle_req;

 	if (!asle)
 		return;

 	asle_req = ioread32(&asle->aslc) & ASLE_REQ_MSK;

 	if (!asle_req) {
 		DRM_DEBUG_DRIVER("non asle set request??\n");
 		return;
 	}

 	if (asle_req & ASLE_SET_ALS_ILLUM) {
 		DRM_DEBUG_DRIVER("Illum is not supported\n");
 		asle_stat |= ASLE_ALS_ILLUM_FAILED;
 	}

 	if (asle_req & ASLE_SET_BACKLIGHT)
 		asle_stat |= asle_set_backlight(dev, ioread32(&asle->bclp));

 	if (asle_req & ASLE_SET_PFIT) {
 		DRM_DEBUG_DRIVER("Pfit is not supported\n");
 		asle_stat |= ASLE_PFIT_FAILED;
 	}

 	if (asle_req & ASLE_SET_PWM_FREQ) {
 		DRM_DEBUG_DRIVER("PWM freq is not supported\n");
 		asle_stat |= ASLE_PWM_FREQ_FAILED;
 	}

 	iowrite32(asle_stat, &asle->aslc);
 }
 #define ASLE_ALS_EN    (1<<0)
 #define ASLE_BLC_EN    (1<<1)
 #define ASLE_PFIT_EN   (1<<2)
 #define ASLE_PFMB_EN   (1<<3)

 void intel_opregion_enable_asle(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;

 	if (asle) {
 		if (IS_MOBILE(dev))
 			intel_enable_asle(dev);

 		iowrite32(ASLE_ALS_EN | ASLE_BLC_EN | ASLE_PFIT_EN |
 			  ASLE_PFMB_EN,
 			  &asle->tche);
 		iowrite32(1, &asle->ardy);
 	}
 }

 #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 opregion_acpi __iomem *acpi;
 	struct acpi_bus_event *event = data;
 	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 &&
 	    (ioread32(&acpi->cevt) & 1) == 0)
 		ret = NOTIFY_BAD;

 	iowrite32(0, &acpi->csts);

 	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 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;
 	int i = 0;

 	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 	if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev)))
 		return;

 	if (acpi_is_video_device(acpi_dev))
 		acpi_video_bus = acpi_dev;
 	else {
 		list_for_each_entry(acpi_cdev, &acpi_dev->children, node) {
 			if (acpi_is_video_device(acpi_cdev)) {
 				acpi_video_bus = acpi_cdev;
 				break;
 			}
 		}
 	}

 	if (!acpi_video_bus) {
 		pr_warn("No ACPI video bus found\n");
 		return;
 	}

 	list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {
 		if (i >= 8) {
 			dev_printk(KERN_ERR, &dev->pdev->dev,
 				    "More than 8 outputs detected\n");
 			return;
 		}
 		status =
 			acpi_evaluate_integer(acpi_cdev->handle, "_ADR",
 						NULL, &device_id);
 		if (ACPI_SUCCESS(status)) {
 			if (!device_id)
 				goto blind_set;
 			iowrite32((u32)(device_id & 0x0f0f),
 				  &opregion->acpi->didl[i]);
 			i++;
 		}
 	}

 end:
 	/* If fewer than 8 outputs, the list must be null terminated */
 	if (i < 8)
 		iowrite32(0, &opregion->acpi->didl[i]);
 	return;

 blind_set:
 	i = 0;
 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		int output_type = ACPI_OTHER_OUTPUT;
 		if (i >= 8) {
 			dev_printk(KERN_ERR, &dev->pdev->dev,
 				    "More than 8 outputs detected\n");
 			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 = ioread32(&opregion->acpi->didl[i]);
 		iowrite32(temp | (1<<31) | output_type | i,
 			  &opregion->acpi->didl[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 = ioread32(&opregion->acpi->didl[i]);
 		iowrite32(disp_id, &opregion->acpi->cadl[i]);
 	} 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) {
 		if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 			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. */
 		iowrite32(0, &opregion->acpi->csts);
 		iowrite32(1, &opregion->acpi->drdy);

 		system_opregion = opregion;
 		register_acpi_notifier(&intel_opregion_notifier);
 	}

 	if (opregion->asle)
 		intel_opregion_enable_asle(dev);
 }

 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->acpi) {
 		iowrite32(0, &opregion->acpi->drdy);

 		system_opregion = NULL;
 		unregister_acpi_notifier(&intel_opregion_notifier);
 	}

 	/* just clear all opregion memory pointers now */
 	iounmap(opregion->header);
 	opregion->header = NULL;
 	opregion->acpi = NULL;
 	opregion->swsci = NULL;
 	opregion->asle = NULL;
 	opregion->vbt = NULL;
 }
 #endif

 int intel_opregion_setup(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_opregion *opregion = &dev_priv->opregion;
 	void __iomem *base;
 	u32 asls, mboxes;
 	char buf[sizeof(OPREGION_SIGNATURE)];
 	int err = 0;

 	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;
 	}

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

 	memcpy_fromio(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->vbt = base + OPREGION_VBT_OFFSET;

 	opregion->lid_state = base + ACPI_CLID;

 	mboxes = ioread32(&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;
 	}
 	if (mboxes & MBOX_ASLE) {
 		DRM_DEBUG_DRIVER("ASLE supported\n");
 		opregion->asle = base + OPREGION_ASLE_OFFSET;
 	}

 	return 0;

 err_out:
 	iounmap(base);
 	return err;
 }
	/*
	* 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.
	*
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

	#include <drm/drmP.h>
	#include <drm/i915_drm.h>
	#include "i915_drv.h"
	#include "intel_drv.h"

	#define PCI_ASLE 0xe4
	#define PCI_ASLS 0xfc

	#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_SIGNATURE "IntelGraphicsMem"
	#define MBOX_ACPI (1<<0)
	#define MBOX_SWSCI (1<<1)
	#define MBOX_ASLE (1<<2)

	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;
	u8 reserved[164];
	} __attribute__((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 */
	u8 rsvd2[60];
	} __attribute__((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];
	} __attribute__((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 */
	u8 rsvd[102];
	} __attribute__((packed));

	/* ASLE irq request bits */
	#define ASLE_SET_ALS_ILLUM (1 << 0)
	#define ASLE_SET_BACKLIGHT (1 << 1)
	#define ASLE_SET_PFIT (1 << 2)
	#define ASLE_SET_PWM_FREQ (1 << 3)
	#define ASLE_REQ_MSK 0xf

	/* response bits of ASLE irq request */
	#define ASLE_ALS_ILLUM_FAILED (1<<10)
	#define ASLE_BACKLIGHT_FAILED (1<<12)
	#define ASLE_PFIT_FAILED (1<<14)
	#define ASLE_PWM_FREQ_FAILED (1<<16)

	/* 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)

	#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)

	#ifdef CONFIG_ACPI
	static u32 asle_set_backlight(struct drm_device *dev, u32 bclp)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
	u32 max;

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

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

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

	max = intel_panel_get_max_backlight(dev);
	intel_panel_set_backlight(dev, bclp * max / 255);
	iowrite32((bclp*0x64)/0xff \| ASLE_CBLV_VALID, &asle->cblv);

	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 */
	return 0;
	}

	static u32 asle_set_pwm_freq(struct drm_device *dev, u32 pfmb)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	if (pfmb & ASLE_PFMB_PWM_VALID) {
	u32 blc_pwm_ctl = I915_READ(BLC_PWM_CTL);
	u32 pwm = pfmb & ASLE_PFMB_PWM_MASK;
	blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
	pwm = pwm >> 9;
	/* FIXME - what do we do with the PWM? */
	}
	return 0;
	}

	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 */
	if (!(pfit & ASLE_PFIT_VALID))
	return ASLE_PFIT_FAILED;
	return 0;
	}

	void intel_opregion_asle_intr(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
	u32 asle_stat = 0;
	u32 asle_req;

	if (!asle)
	return;

	asle_req = ioread32(&asle->aslc) & ASLE_REQ_MSK;

	if (!asle_req) {
	DRM_DEBUG_DRIVER("non asle set request??\n");
	return;
	}

	if (asle_req & ASLE_SET_ALS_ILLUM)
	asle_stat \|= asle_set_als_illum(dev, ioread32(&asle->alsi));

	if (asle_req & ASLE_SET_BACKLIGHT)
	asle_stat \|= asle_set_backlight(dev, ioread32(&asle->bclp));

	if (asle_req & ASLE_SET_PFIT)
	asle_stat \|= asle_set_pfit(dev, ioread32(&asle->pfit));

	if (asle_req & ASLE_SET_PWM_FREQ)
	asle_stat \|= asle_set_pwm_freq(dev, ioread32(&asle->pfmb));

	iowrite32(asle_stat, &asle->aslc);
	}

	void intel_opregion_gse_intr(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;
	u32 asle_stat = 0;
	u32 asle_req;

	if (!asle)
	return;

	asle_req = ioread32(&asle->aslc) & ASLE_REQ_MSK;

	if (!asle_req) {
	DRM_DEBUG_DRIVER("non asle set request??\n");
	return;
	}

	if (asle_req & ASLE_SET_ALS_ILLUM) {
	DRM_DEBUG_DRIVER("Illum is not supported\n");
	asle_stat \|= ASLE_ALS_ILLUM_FAILED;
	}

	if (asle_req & ASLE_SET_BACKLIGHT)
	asle_stat \|= asle_set_backlight(dev, ioread32(&asle->bclp));

	if (asle_req & ASLE_SET_PFIT) {
	DRM_DEBUG_DRIVER("Pfit is not supported\n");
	asle_stat \|= ASLE_PFIT_FAILED;
	}

	if (asle_req & ASLE_SET_PWM_FREQ) {
	DRM_DEBUG_DRIVER("PWM freq is not supported\n");
	asle_stat \|= ASLE_PWM_FREQ_FAILED;
	}

	iowrite32(asle_stat, &asle->aslc);
	}
	#define ASLE_ALS_EN (1<<0)
	#define ASLE_BLC_EN (1<<1)
	#define ASLE_PFIT_EN (1<<2)
	#define ASLE_PFMB_EN (1<<3)

	void intel_opregion_enable_asle(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct opregion_asle __iomem *asle = dev_priv->opregion.asle;

	if (asle) {
	if (IS_MOBILE(dev))
	intel_enable_asle(dev);

	iowrite32(ASLE_ALS_EN \| ASLE_BLC_EN \| ASLE_PFIT_EN \|
	ASLE_PFMB_EN,
	&asle->tche);
	iowrite32(1, &asle->ardy);
	}
	}

	#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 opregion_acpi __iomem *acpi;
	struct acpi_bus_event *event = data;
	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 &&
	(ioread32(&acpi->cevt) & 1) == 0)
	ret = NOTIFY_BAD;

	iowrite32(0, &acpi->csts);

	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 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;
	int i = 0;

	handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
	if (!handle \|\| ACPI_FAILURE(acpi_bus_get_device(handle, &acpi_dev)))
	return;

	if (acpi_is_video_device(acpi_dev))
	acpi_video_bus = acpi_dev;
	else {
	list_for_each_entry(acpi_cdev, &acpi_dev->children, node) {
	if (acpi_is_video_device(acpi_cdev)) {
	acpi_video_bus = acpi_cdev;
	break;
	}
	}
	}

	if (!acpi_video_bus) {
	pr_warn("No ACPI video bus found\n");
	return;
	}

	list_for_each_entry(acpi_cdev, &acpi_video_bus->children, node) {
	if (i >= 8) {
	dev_printk(KERN_ERR, &dev->pdev->dev,
	"More than 8 outputs detected\n");
	return;
	}
	status =
	acpi_evaluate_integer(acpi_cdev->handle, "_ADR",
	NULL, &device_id);
	if (ACPI_SUCCESS(status)) {
	if (!device_id)
	goto blind_set;
	iowrite32((u32)(device_id & 0x0f0f),
	&opregion->acpi->didl[i]);
	i++;
	}
	}

	end:
	/* If fewer than 8 outputs, the list must be null terminated */
	if (i < 8)
	iowrite32(0, &opregion->acpi->didl[i]);
	return;

	blind_set:
	i = 0;
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	int output_type = ACPI_OTHER_OUTPUT;
	if (i >= 8) {
	dev_printk(KERN_ERR, &dev->pdev->dev,
	"More than 8 outputs detected\n");
	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 = ioread32(&opregion->acpi->didl[i]);
	iowrite32(temp \| (1<<31) \| output_type \| i,
	&opregion->acpi->didl[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 = ioread32(&opregion->acpi->didl[i]);
	iowrite32(disp_id, &opregion->acpi->cadl[i]);
	} 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) {
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
	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. */
	iowrite32(0, &opregion->acpi->csts);
	iowrite32(1, &opregion->acpi->drdy);

	system_opregion = opregion;
	register_acpi_notifier(&intel_opregion_notifier);
	}

	if (opregion->asle)
	intel_opregion_enable_asle(dev);
	}

	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->acpi) {
	iowrite32(0, &opregion->acpi->drdy);

	system_opregion = NULL;
	unregister_acpi_notifier(&intel_opregion_notifier);
	}

	/* just clear all opregion memory pointers now */
	iounmap(opregion->header);
	opregion->header = NULL;
	opregion->acpi = NULL;
	opregion->swsci = NULL;
	opregion->asle = NULL;
	opregion->vbt = NULL;
	}
	#endif

	int intel_opregion_setup(struct drm_device *dev)
	{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct intel_opregion *opregion = &dev_priv->opregion;
	void __iomem *base;
	u32 asls, mboxes;
	char buf[sizeof(OPREGION_SIGNATURE)];
	int err = 0;

	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;
	}

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

	memcpy_fromio(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->vbt = base + OPREGION_VBT_OFFSET;

	opregion->lid_state = base + ACPI_CLID;

	mboxes = ioread32(&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;
	}
	if (mboxes & MBOX_ASLE) {
	DRM_DEBUG_DRIVER("ASLE supported\n");
	opregion->asle = base + OPREGION_ASLE_OFFSET;
	}

	return 0;

	err_out:
	iounmap(base);
	return err;
	}