video.c 58.7 KB
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/*
 *  video.c - ACPI Video Driver ($Revision:$)
 *
 *  Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
 *  Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
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 *  Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
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 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/input.h>
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#include <linux/backlight.h>
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#include <linux/thermal.h>
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#include <linux/video_output.h>
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#include <linux/sort.h>
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#include <linux/pci.h>
#include <linux/pci_ids.h>
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#include <asm/uaccess.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_VIDEO_CLASS		"video"
#define ACPI_VIDEO_BUS_NAME		"Video Bus"
#define ACPI_VIDEO_DEVICE_NAME		"Video Device"
#define ACPI_VIDEO_NOTIFY_SWITCH	0x80
#define ACPI_VIDEO_NOTIFY_PROBE		0x81
#define ACPI_VIDEO_NOTIFY_CYCLE		0x82
#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT	0x83
#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT	0x84

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#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS	0x85
#define	ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS	0x86
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS	0x87
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS	0x88
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF		0x89
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#define MAX_NAME_LEN	20
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#define ACPI_VIDEO_DISPLAY_CRT	1
#define ACPI_VIDEO_DISPLAY_TV	2
#define ACPI_VIDEO_DISPLAY_DVI	3
#define ACPI_VIDEO_DISPLAY_LCD	4

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#define _COMPONENT		ACPI_VIDEO_COMPONENT
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ACPI_MODULE_NAME("video");
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MODULE_AUTHOR("Bruno Ducrot");
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MODULE_DESCRIPTION("ACPI Video Driver");
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MODULE_LICENSE("GPL");

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static int brightness_switch_enabled = 1;
module_param(brightness_switch_enabled, bool, 0644);

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static int acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device, int type);
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static int acpi_video_resume(struct acpi_device *device);
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static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
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static const struct acpi_device_id video_device_ids[] = {
	{ACPI_VIDEO_HID, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, video_device_ids);

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static struct acpi_driver acpi_video_bus = {
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	.name = "video",
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	.class = ACPI_VIDEO_CLASS,
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	.ids = video_device_ids,
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	.ops = {
		.add = acpi_video_bus_add,
		.remove = acpi_video_bus_remove,
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		.resume = acpi_video_resume,
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		.notify = acpi_video_bus_notify,
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		},
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};

struct acpi_video_bus_flags {
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	u8 multihead:1;		/* can switch video heads */
	u8 rom:1;		/* can retrieve a video rom */
	u8 post:1;		/* can configure the head to */
	u8 reserved:5;
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};

struct acpi_video_bus_cap {
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	u8 _DOS:1;		/*Enable/Disable output switching */
	u8 _DOD:1;		/*Enumerate all devices attached to display adapter */
	u8 _ROM:1;		/*Get ROM Data */
	u8 _GPD:1;		/*Get POST Device */
	u8 _SPD:1;		/*Set POST Device */
	u8 _VPO:1;		/*Video POST Options */
	u8 reserved:2;
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};

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struct acpi_video_device_attrib {
	u32 display_index:4;	/* A zero-based instance of the Display */
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	u32 display_port_attachment:4;	/*This field differentiates the display type */
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	u32 display_type:4;	/*Describe the specific type in use */
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	u32 vendor_specific:4;	/*Chipset Vendor Specific */
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	u32 bios_can_detect:1;	/*BIOS can detect the device */
	u32 depend_on_vga:1;	/*Non-VGA output device whose power is related to 
				   the VGA device. */
	u32 pipe_id:3;		/*For VGA multiple-head devices. */
	u32 reserved:10;	/*Must be 0 */
	u32 device_id_scheme:1;	/*Device ID Scheme */
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};

struct acpi_video_enumerated_device {
	union {
		u32 int_val;
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		struct acpi_video_device_attrib attrib;
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	} value;
	struct acpi_video_device *bind_info;
};

struct acpi_video_bus {
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	struct acpi_device *device;
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	u8 dos_setting;
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	struct acpi_video_enumerated_device *attached_array;
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	u8 attached_count;
	struct acpi_video_bus_cap cap;
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	struct acpi_video_bus_flags flags;
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	struct list_head video_device_list;
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	struct mutex device_list_lock;	/* protects video_device_list */
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	struct proc_dir_entry *dir;
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	struct input_dev *input;
	char phys[32];	/* for input device */
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};

struct acpi_video_device_flags {
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	u8 crt:1;
	u8 lcd:1;
	u8 tvout:1;
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	u8 dvi:1;
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	u8 bios:1;
	u8 unknown:1;
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	u8 reserved:2;
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};

struct acpi_video_device_cap {
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	u8 _ADR:1;		/*Return the unique ID */
	u8 _BCL:1;		/*Query list of brightness control levels supported */
	u8 _BCM:1;		/*Set the brightness level */
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	u8 _BQC:1;		/* Get current brightness level */
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	u8 _BCQ:1;		/* Some buggy BIOS uses _BCQ instead of _BQC */
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	u8 _DDC:1;		/*Return the EDID for this device */
	u8 _DCS:1;		/*Return status of output device */
	u8 _DGS:1;		/*Query graphics state */
	u8 _DSS:1;		/*Device state set */
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};

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struct acpi_video_brightness_flags {
	u8 _BCL_no_ac_battery_levels:1;	/* no AC/Battery levels in _BCL */
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	u8 _BCL_reversed:1;		/* _BCL package is in a reversed order*/
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	u8 _BCL_use_index:1;		/* levels in _BCL are index values */
	u8 _BCM_use_index:1;		/* input of _BCM is an index value */
	u8 _BQC_use_index:1;		/* _BQC returns an index value */
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};

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struct acpi_video_device_brightness {
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	int curr;
	int count;
	int *levels;
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	struct acpi_video_brightness_flags flags;
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};

struct acpi_video_device {
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	unsigned long device_id;
	struct acpi_video_device_flags flags;
	struct acpi_video_device_cap cap;
	struct list_head entry;
	struct acpi_video_bus *video;
	struct acpi_device *dev;
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	struct acpi_video_device_brightness *brightness;
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	struct backlight_device *backlight;
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	struct thermal_cooling_device *cdev;
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	struct output_device *output_dev;
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};

/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
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static const struct file_operations acpi_video_bus_info_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_bus_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
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static const struct file_operations acpi_video_bus_ROM_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_bus_ROM_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
					    struct file *file);
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static const struct file_operations acpi_video_bus_POST_info_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_bus_POST_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
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static ssize_t acpi_video_bus_write_POST(struct file *file,
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	const char __user *buffer, size_t count, loff_t *data);
static const struct file_operations acpi_video_bus_POST_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_bus_POST_open_fs,
	.read = seq_read,
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	.write = acpi_video_bus_write_POST,
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	.llseek = seq_lseek,
	.release = single_release,
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};

static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
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static ssize_t acpi_video_bus_write_DOS(struct file *file,
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	const char __user *buffer, size_t count, loff_t *data);
static const struct file_operations acpi_video_bus_DOS_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_bus_DOS_open_fs,
	.read = seq_read,
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	.write = acpi_video_bus_write_DOS,
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	.llseek = seq_lseek,
	.release = single_release,
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};

/* device */
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static int acpi_video_device_info_open_fs(struct inode *inode,
					  struct file *file);
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static const struct file_operations acpi_video_device_info_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_device_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static int acpi_video_device_state_open_fs(struct inode *inode,
					   struct file *file);
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static ssize_t acpi_video_device_write_state(struct file *file,
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	const char __user *buffer, size_t count, loff_t *data);
static const struct file_operations acpi_video_device_state_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_device_state_open_fs,
	.read = seq_read,
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	.write = acpi_video_device_write_state,
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	.llseek = seq_lseek,
	.release = single_release,
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};

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static int acpi_video_device_brightness_open_fs(struct inode *inode,
						struct file *file);
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static ssize_t acpi_video_device_write_brightness(struct file *file,
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	const char __user *buffer, size_t count, loff_t *data);
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static struct file_operations acpi_video_device_brightness_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_device_brightness_open_fs,
	.read = seq_read,
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	.write = acpi_video_device_write_brightness,
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	.llseek = seq_lseek,
	.release = single_release,
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};

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static int acpi_video_device_EDID_open_fs(struct inode *inode,
					  struct file *file);
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static const struct file_operations acpi_video_device_EDID_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_video_device_EDID_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};

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static const char device_decode[][30] = {
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	"motherboard VGA device",
	"PCI VGA device",
	"AGP VGA device",
	"UNKNOWN",
};

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static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
static void acpi_video_device_rebind(struct acpi_video_bus *video);
static void acpi_video_device_bind(struct acpi_video_bus *video,
				   struct acpi_video_device *device);
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static int acpi_video_device_enumerate(struct acpi_video_bus *video);
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static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
			int level);
static int acpi_video_device_lcd_get_level_current(
			struct acpi_video_device *device,
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			unsigned long long *level);
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static int acpi_video_get_next_level(struct acpi_video_device *device,
				     u32 level_current, u32 event);
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static int acpi_video_switch_brightness(struct acpi_video_device *device,
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					 int event);
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static int acpi_video_device_get_state(struct acpi_video_device *device,
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			    unsigned long long *state);
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static int acpi_video_output_get(struct output_device *od);
static int acpi_video_device_set_state(struct acpi_video_device *device, int state);
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/*backlight device sysfs support*/
static int acpi_video_get_brightness(struct backlight_device *bd)
{
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	unsigned long long cur_level;
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	int i;
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	struct acpi_video_device *vd =
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		(struct acpi_video_device *)bl_get_data(bd);
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	if (acpi_video_device_lcd_get_level_current(vd, &cur_level))
		return -EINVAL;
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	for (i = 2; i < vd->brightness->count; i++) {
		if (vd->brightness->levels[i] == cur_level)
			/* The first two entries are special - see page 575
			   of the ACPI spec 3.0 */
			return i-2;
	}
	return 0;
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}

static int acpi_video_set_brightness(struct backlight_device *bd)
{
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	int request_level = bd->props.brightness + 2;
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	struct acpi_video_device *vd =
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		(struct acpi_video_device *)bl_get_data(bd);
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	return acpi_video_device_lcd_set_level(vd,
				vd->brightness->levels[request_level]);
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}

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static struct backlight_ops acpi_backlight_ops = {
	.get_brightness = acpi_video_get_brightness,
	.update_status  = acpi_video_set_brightness,
};

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/*video output device sysfs support*/
static int acpi_video_output_get(struct output_device *od)
{
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	unsigned long long state;
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	struct acpi_video_device *vd =
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		(struct acpi_video_device *)dev_get_drvdata(&od->dev);
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	acpi_video_device_get_state(vd, &state);
	return (int)state;
}

static int acpi_video_output_set(struct output_device *od)
{
	unsigned long state = od->request_state;
	struct acpi_video_device *vd=
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		(struct acpi_video_device *)dev_get_drvdata(&od->dev);
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	return acpi_video_device_set_state(vd, state);
}

static struct output_properties acpi_output_properties = {
	.set_state = acpi_video_output_set,
	.get_status = acpi_video_output_get,
};
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/* thermal cooling device callbacks */
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static int video_get_max_state(struct thermal_cooling_device *cdev, unsigned
			       long *state)
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{
	struct acpi_device *device = cdev->devdata;
	struct acpi_video_device *video = acpi_driver_data(device);

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	*state = video->brightness->count - 3;
	return 0;
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}

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static int video_get_cur_state(struct thermal_cooling_device *cdev, unsigned
			       long *state)
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{
	struct acpi_device *device = cdev->devdata;
	struct acpi_video_device *video = acpi_driver_data(device);
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	unsigned long long level;
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	int offset;
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	if (acpi_video_device_lcd_get_level_current(video, &level))
		return -EINVAL;
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	for (offset = 2; offset < video->brightness->count; offset++)
		if (level == video->brightness->levels[offset]) {
			*state = video->brightness->count - offset - 1;
			return 0;
		}
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	return -EINVAL;
}

static int
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video_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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{
	struct acpi_device *device = cdev->devdata;
	struct acpi_video_device *video = acpi_driver_data(device);
	int level;

	if ( state >= video->brightness->count - 2)
		return -EINVAL;

	state = video->brightness->count - state;
	level = video->brightness->levels[state -1];
	return acpi_video_device_lcd_set_level(video, level);
}

static struct thermal_cooling_device_ops video_cooling_ops = {
	.get_max_state = video_get_max_state,
	.get_cur_state = video_get_cur_state,
	.set_cur_state = video_set_cur_state,
};

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/* --------------------------------------------------------------------------
                               Video Management
   -------------------------------------------------------------------------- */

/* device */

static int
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acpi_video_device_query(struct acpi_video_device *device, unsigned long long *state)
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{
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	int status;
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	status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);
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	return status;
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}

static int
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acpi_video_device_get_state(struct acpi_video_device *device,
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			    unsigned long long *state)
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{
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	int status;
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	status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);
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	return status;
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}

static int
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acpi_video_device_set_state(struct acpi_video_device *device, int state)
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{
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	int status;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
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	unsigned long long ret;
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	arg0.integer.value = state;
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	status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);
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	return status;
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}

static int
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acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
				   union acpi_object **levels)
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{
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485 486 487
	int status;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
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488 489 490 491


	*levels = NULL;

492
	status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
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493
	if (!ACPI_SUCCESS(status))
494
		return status;
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495
	obj = (union acpi_object *)buffer.pointer;
496
	if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
497
		printk(KERN_ERR PREFIX "Invalid _BCL data\n");
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		status = -EFAULT;
		goto err;
	}

	*levels = obj;

504
	return 0;
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505

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      err:
507
	kfree(buffer.pointer);
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508

509
	return status;
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}

static int
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513
acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
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514
{
515
	int status;
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	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
518
	int state;
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	arg0.integer.value = level;

522 523 524 525 526 527 528
	status = acpi_evaluate_object(device->dev->handle, "_BCM",
				      &args, NULL);
	if (ACPI_FAILURE(status)) {
		ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
		return -EIO;
	}

529
	device->brightness->curr = level;
530
	for (state = 2; state < device->brightness->count; state++)
531
		if (level == device->brightness->levels[state]) {
532 533
			if (device->backlight)
				device->backlight->props.brightness = state - 2;
534 535
			return 0;
		}
536

537 538
	ACPI_ERROR((AE_INFO, "Current brightness invalid"));
	return -EINVAL;
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}

541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
/*
 * For some buggy _BQC methods, we need to add a constant value to
 * the _BQC return value to get the actual current brightness level
 */

static int bqc_offset_aml_bug_workaround;
static int __init video_set_bqc_offset(const struct dmi_system_id *d)
{
	bqc_offset_aml_bug_workaround = 9;
	return 0;
}

static struct dmi_system_id video_dmi_table[] __initdata = {
	/*
	 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
	 */
	{
	 .callback = video_set_bqc_offset,
	 .ident = "Acer Aspire 5720",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
		},
	},
565 566 567 568 569 570 571 572
	{
	 .callback = video_set_bqc_offset,
	 .ident = "Acer Aspire 5710Z",
	 .matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
		DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
		},
	},
573 574 575
	{}
};

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static int
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577
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
578
					unsigned long long *level)
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579
{
580 581
	acpi_status status = AE_OK;

582 583 584 585
	if (device->cap._BQC || device->cap._BCQ) {
		char *buf = device->cap._BQC ? "_BQC" : "_BCQ";

		status = acpi_evaluate_integer(device->dev->handle, buf,
586 587
						NULL, level);
		if (ACPI_SUCCESS(status)) {
588 589 590 591 592 593 594
			if (device->brightness->flags._BQC_use_index) {
				if (device->brightness->flags._BCL_reversed)
					*level = device->brightness->count
								 - 3 - (*level);
				*level = device->brightness->levels[*level + 2];

			}
595
			*level += bqc_offset_aml_bug_workaround;
596 597 598 599 600 601 602 603 604 605
			device->brightness->curr = *level;
			return 0;
		} else {
			/* Fixme:
			 * should we return an error or ignore this failure?
			 * dev->brightness->curr is a cached value which stores
			 * the correct current backlight level in most cases.
			 * ACPI video backlight still works w/ buggy _BQC.
			 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
			 */
606 607
			ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
			device->cap._BQC = device->cap._BCQ = 0;
608 609 610
		}
	}

611
	*level = device->brightness->curr;
612
	return 0;
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}

static int
L
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616 617
acpi_video_device_EDID(struct acpi_video_device *device,
		       union acpi_object **edid, ssize_t length)
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618
{
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	int status;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *obj;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
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	*edid = NULL;

	if (!device)
629
		return -ENODEV;
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	if (length == 128)
		arg0.integer.value = 1;
	else if (length == 256)
		arg0.integer.value = 2;
	else
635
		return -EINVAL;
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636

637
	status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
L
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638
	if (ACPI_FAILURE(status))
639
		return -ENODEV;
L
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640

641
	obj = buffer.pointer;
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642 643 644 645

	if (obj && obj->type == ACPI_TYPE_BUFFER)
		*edid = obj;
	else {
646
		printk(KERN_ERR PREFIX "Invalid _DDC data\n");
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647 648 649 650
		status = -EFAULT;
		kfree(obj);
	}

651
	return status;
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652 653 654 655 656
}

/* bus */

static int
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657
acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
L
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658
{
L
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659
	int status;
660
	unsigned long long tmp;
L
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661 662
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
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663 664 665 666


	arg0.integer.value = option;

667
	status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
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668
	if (ACPI_SUCCESS(status))
L
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669
		status = tmp ? (-EINVAL) : (AE_OK);
L
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670

671
	return status;
L
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672 673 674
}

static int
675
acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long long *id)
L
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676 677 678
{
	int status;

679
	status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);
L
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680

681
	return status;
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682 683 684
}

static int
L
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685
acpi_video_bus_POST_options(struct acpi_video_bus *video,
686
			    unsigned long long *options)
L
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687
{
L
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688
	int status;
L
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689

690
	status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
L
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691 692
	*options &= 3;

693
	return status;
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}

/*
 *  Arg:
 *  	video		: video bus device pointer
 *	bios_flag	: 
 *		0.	The system BIOS should NOT automatically switch(toggle)
 *			the active display output.
 *		1.	The system BIOS should automatically switch (toggle) the
703
 *			active display output. No switch event.
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704 705 706 707 708 709
 *		2.	The _DGS value should be locked.
 *		3.	The system BIOS should not automatically switch (toggle) the
 *			active display output, but instead generate the display switch
 *			event notify code.
 *	lcd_flag	:
 *		0.	The system BIOS should automatically control the brightness level
710
 *			of the LCD when the power changes from AC to DC
L
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711
 *		1. 	The system BIOS should NOT automatically control the brightness 
712
 *			level of the LCD when the power changes from AC to DC.
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713 714 715 716 717
 * Return Value:
 * 		-1	wrong arg.
 */

static int
L
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718
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
L
Linus Torvalds 已提交
719
{
L
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720 721 722
	acpi_integer status = 0;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
L
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723 724


L
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725
	if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
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726 727 728 729 730
		status = -1;
		goto Failed;
	}
	arg0.integer.value = (lcd_flag << 2) | bios_flag;
	video->dos_setting = arg0.integer.value;
731
	acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);
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732

L
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733
      Failed:
734
	return status;
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}

737 738 739 740 741 742 743 744 745 746
/*
 * Simple comparison function used to sort backlight levels.
 */

static int
acpi_video_cmp_level(const void *a, const void *b)
{
	return *(int *)a - *(int *)b;
}

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/*
 *  Arg:	
 *  	device	: video output device (LCD, CRT, ..)
 *
 *  Return Value:
752 753 754 755 756 757 758 759 760
 *	Maximum brightness level
 *
 *  Allocate and initialize device->brightness.
 */

static int
acpi_video_init_brightness(struct acpi_video_device *device)
{
	union acpi_object *obj = NULL;
761
	int i, max_level = 0, count = 0, level_ac_battery = 0;
762
	unsigned long long level, level_old;
763 764
	union acpi_object *o;
	struct acpi_video_device_brightness *br = NULL;
765
	int result = -EINVAL;
766 767 768 769 770 771 772 773 774 775 776 777 778

	if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
						"LCD brightness level\n"));
		goto out;
	}

	if (obj->package.count < 2)
		goto out;

	br = kzalloc(sizeof(*br), GFP_KERNEL);
	if (!br) {
		printk(KERN_ERR "can't allocate memory\n");
779
		result = -ENOMEM;
780 781 782
		goto out;
	}

783
	br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
784
				GFP_KERNEL);
785 786
	if (!br->levels) {
		result = -ENOMEM;
787
		goto out_free;
788
	}
789 790 791 792 793 794 795 796 797 798 799 800 801 802

	for (i = 0; i < obj->package.count; i++) {
		o = (union acpi_object *)&obj->package.elements[i];
		if (o->type != ACPI_TYPE_INTEGER) {
			printk(KERN_ERR PREFIX "Invalid data\n");
			continue;
		}
		br->levels[count] = (u32) o->integer.value;

		if (br->levels[count] > max_level)
			max_level = br->levels[count];
		count++;
	}

803 804 805 806 807 808
	/*
	 * some buggy BIOS don't export the levels
	 * when machine is on AC/Battery in _BCL package.
	 * In this case, the first two elements in _BCL packages
	 * are also supported brightness levels that OS should take care of.
	 */
809 810
	for (i = 2; i < count; i++) {
		if (br->levels[i] == br->levels[0])
811
			level_ac_battery++;
812 813 814
		if (br->levels[i] == br->levels[1])
			level_ac_battery++;
	}
815 816 817 818 819 820 821 822 823 824

	if (level_ac_battery < 2) {
		level_ac_battery = 2 - level_ac_battery;
		br->flags._BCL_no_ac_battery_levels = 1;
		for (i = (count - 1 + level_ac_battery); i >= 2; i--)
			br->levels[i] = br->levels[i - level_ac_battery];
		count += level_ac_battery;
	} else if (level_ac_battery > 2)
		ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package\n"));

825 826 827 828 829 830 831 832
	/* Check if the _BCL package is in a reversed order */
	if (max_level == br->levels[2]) {
		br->flags._BCL_reversed = 1;
		sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
			acpi_video_cmp_level, NULL);
	} else if (max_level != br->levels[count - 1])
		ACPI_ERROR((AE_INFO,
			    "Found unordered _BCL package\n"));
833 834 835

	br->count = count;
	device->brightness = br;
836 837 838 839 840 841 842 843 844 845 846 847

	/* Check the input/output of _BQC/_BCL/_BCM */
	if ((max_level < 100) && (max_level <= (count - 2)))
		br->flags._BCL_use_index = 1;

	/*
	 * _BCM is always consistent with _BCL,
	 * at least for all the laptops we have ever seen.
	 */
	br->flags._BCM_use_index = br->flags._BCL_use_index;

	/* _BQC uses INDEX while _BCL uses VALUE in some laptops */
848 849 850 851 852
	br->curr = level_old = max_level;

	if (!device->cap._BQC)
		goto set_level;

853 854 855 856
	result = acpi_video_device_lcd_get_level_current(device, &level_old);
	if (result)
		goto out_free_levels;

857 858 859 860
	/*
	 * Set the level to maximum and check if _BQC uses indexed value
	 */
	result = acpi_video_device_lcd_set_level(device, max_level);
861 862 863 864 865 866 867
	if (result)
		goto out_free_levels;

	result = acpi_video_device_lcd_get_level_current(device, &level);
	if (result)
		goto out_free_levels;

868 869 870 871 872 873 874 875 876 877 878 879 880
	br->flags._BQC_use_index = (level == max_level ? 0 : 1);

	if (!br->flags._BQC_use_index)
		goto set_level;

	if (br->flags._BCL_reversed)
		level_old = (br->count - 1) - level_old;
	level_old = br->levels[level_old];

set_level:
	result = acpi_video_device_lcd_set_level(device, level_old);
	if (result)
		goto out_free_levels;
881

882 883
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
			  "found %d brightness levels\n", count - 2));
884
	kfree(obj);
885
	return result;
886 887 888 889 890 891 892 893

out_free_levels:
	kfree(br->levels);
out_free:
	kfree(br);
out:
	device->brightness = NULL;
	kfree(obj);
894
	return result;
895 896 897 898 899 900 901
}

/*
 *  Arg:
 *	device	: video output device (LCD, CRT, ..)
 *
 *  Return Value:
L
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902 903
 *  	None
 *
904
 *  Find out all required AML methods defined under the output
L
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905 906 907
 *  device.
 */

L
Len Brown 已提交
908
static void acpi_video_device_find_cap(struct acpi_video_device *device)
L
Linus Torvalds 已提交
909 910 911 912
{
	acpi_handle h_dummy1;


913
	memset(&device->cap, 0, sizeof(device->cap));
L
Linus Torvalds 已提交
914

915
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
L
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916 917
		device->cap._ADR = 1;
	}
918
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
L
Len Brown 已提交
919
		device->cap._BCL = 1;
L
Linus Torvalds 已提交
920
	}
921
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
L
Len Brown 已提交
922
		device->cap._BCM = 1;
L
Linus Torvalds 已提交
923
	}
924 925
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
		device->cap._BQC = 1;
926 927 928 929 930 931
	else if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCQ",
				&h_dummy1))) {
		printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
		device->cap._BCQ = 1;
	}

932
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
L
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933
		device->cap._DDC = 1;
L
Linus Torvalds 已提交
934
	}
935
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
L
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936 937
		device->cap._DCS = 1;
	}
938
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
L
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939 940
		device->cap._DGS = 1;
	}
941
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
L
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942 943 944
		device->cap._DSS = 1;
	}

945
	if (acpi_video_backlight_support()) {
946
		int result;
947 948
		static int count = 0;
		char *name;
949 950 951 952

		result = acpi_video_init_brightness(device);
		if (result)
			return;
953 954 955 956 957 958
		name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
		if (!name)
			return;

		sprintf(name, "acpi_video%d", count++);
		device->backlight = backlight_device_register(name,
959
			NULL, device, &acpi_backlight_ops);
960
		device->backlight->props.max_brightness = device->brightness->count-3;
961
		kfree(name);
962 963 964

		device->cdev = thermal_cooling_device_register("LCD",
					device->dev, &video_cooling_ops);
965 966 967
		if (IS_ERR(device->cdev))
			return;

968 969
		dev_info(&device->dev->dev, "registered as cooling_device%d\n",
			 device->cdev->id);
970 971 972 973 974 975 976 977 978 979
		result = sysfs_create_link(&device->dev->dev.kobj,
				&device->cdev->device.kobj,
				"thermal_cooling");
		if (result)
			printk(KERN_ERR PREFIX "Create sysfs link\n");
		result = sysfs_create_link(&device->cdev->device.kobj,
				&device->dev->dev.kobj, "device");
		if (result)
			printk(KERN_ERR PREFIX "Create sysfs link\n");

980
	}
981 982 983 984 985 986 987 988 989 990 991 992 993 994

	if (acpi_video_display_switch_support()) {

		if (device->cap._DCS && device->cap._DSS) {
			static int count;
			char *name;
			name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
			if (!name)
				return;
			sprintf(name, "acpi_video%d", count++);
			device->output_dev = video_output_register(name,
					NULL, device, &acpi_output_properties);
			kfree(name);
		}
995
	}
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996 997 998 999 1000 1001 1002 1003 1004
}

/*
 *  Arg:	
 *  	device	: video output device (VGA)
 *
 *  Return Value:
 *  	None
 *
1005
 *  Find out all required AML methods defined under the video bus device.
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 */

L
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1008
static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
L
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1009
{
L
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1010
	acpi_handle h_dummy1;
L
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1011

1012
	memset(&video->cap, 0, sizeof(video->cap));
1013
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
L
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1014 1015
		video->cap._DOS = 1;
	}
1016
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
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1017 1018
		video->cap._DOD = 1;
	}
1019
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
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1020 1021
		video->cap._ROM = 1;
	}
1022
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
L
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1023 1024
		video->cap._GPD = 1;
	}
1025
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
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1026 1027
		video->cap._SPD = 1;
	}
1028
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
L
Linus Torvalds 已提交
1029 1030 1031 1032 1033 1034 1035 1036 1037
		video->cap._VPO = 1;
	}
}

/*
 * Check whether the video bus device has required AML method to
 * support the desired features
 */

L
Len Brown 已提交
1038
static int acpi_video_bus_check(struct acpi_video_bus *video)
L
Linus Torvalds 已提交
1039
{
L
Len Brown 已提交
1040
	acpi_status status = -ENOENT;
1041
	struct device *dev;
L
Linus Torvalds 已提交
1042 1043

	if (!video)
1044
		return -EINVAL;
L
Linus Torvalds 已提交
1045

1046 1047 1048 1049 1050
	dev = acpi_get_physical_pci_device(video->device->handle);
	if (!dev)
		return -ENODEV;
	put_device(dev);

L
Linus Torvalds 已提交
1051 1052 1053 1054
	/* Since there is no HID, CID and so on for VGA driver, we have
	 * to check well known required nodes.
	 */

1055
	/* Does this device support video switching? */
L
Len Brown 已提交
1056
	if (video->cap._DOS) {
L
Linus Torvalds 已提交
1057 1058 1059 1060
		video->flags.multihead = 1;
		status = 0;
	}

1061
	/* Does this device support retrieving a video ROM? */
L
Len Brown 已提交
1062
	if (video->cap._ROM) {
L
Linus Torvalds 已提交
1063 1064 1065 1066
		video->flags.rom = 1;
		status = 0;
	}

1067
	/* Does this device support configuring which video device to POST? */
L
Len Brown 已提交
1068
	if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
L
Linus Torvalds 已提交
1069 1070 1071 1072
		video->flags.post = 1;
		status = 0;
	}

1073
	return status;
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078 1079
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

L
Len Brown 已提交
1080
static struct proc_dir_entry *acpi_video_dir;
L
Linus Torvalds 已提交
1081 1082 1083

/* video devices */

L
Len Brown 已提交
1084
static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1085
{
1086
	struct acpi_video_device *dev = seq->private;
L
Linus Torvalds 已提交
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099


	if (!dev)
		goto end;

	seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
	seq_printf(seq, "type:         ");
	if (dev->flags.crt)
		seq_printf(seq, "CRT\n");
	else if (dev->flags.lcd)
		seq_printf(seq, "LCD\n");
	else if (dev->flags.tvout)
		seq_printf(seq, "TVOUT\n");
1100 1101
	else if (dev->flags.dvi)
		seq_printf(seq, "DVI\n");
L
Linus Torvalds 已提交
1102 1103 1104
	else
		seq_printf(seq, "UNKNOWN\n");

L
Len Brown 已提交
1105
	seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");
L
Linus Torvalds 已提交
1106

L
Len Brown 已提交
1107
      end:
1108
	return 0;
L
Linus Torvalds 已提交
1109 1110 1111
}

static int
L
Len Brown 已提交
1112
acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1113 1114 1115 1116 1117
{
	return single_open(file, acpi_video_device_info_seq_show,
			   PDE(inode)->data);
}

L
Len Brown 已提交
1118
static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1119
{
L
Len Brown 已提交
1120
	int status;
1121
	struct acpi_video_device *dev = seq->private;
1122
	unsigned long long state;
L
Linus Torvalds 已提交
1123 1124 1125 1126 1127 1128 1129 1130


	if (!dev)
		goto end;

	status = acpi_video_device_get_state(dev, &state);
	seq_printf(seq, "state:     ");
	if (ACPI_SUCCESS(status))
1131
		seq_printf(seq, "0x%02llx\n", state);
L
Linus Torvalds 已提交
1132 1133 1134 1135 1136 1137
	else
		seq_printf(seq, "<not supported>\n");

	status = acpi_video_device_query(dev, &state);
	seq_printf(seq, "query:     ");
	if (ACPI_SUCCESS(status))
1138
		seq_printf(seq, "0x%02llx\n", state);
L
Linus Torvalds 已提交
1139 1140 1141
	else
		seq_printf(seq, "<not supported>\n");

L
Len Brown 已提交
1142
      end:
1143
	return 0;
L
Linus Torvalds 已提交
1144 1145 1146
}

static int
L
Len Brown 已提交
1147
acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1148 1149 1150 1151 1152 1153
{
	return single_open(file, acpi_video_device_state_seq_show,
			   PDE(inode)->data);
}

static ssize_t
L
Len Brown 已提交
1154 1155 1156
acpi_video_device_write_state(struct file *file,
			      const char __user * buffer,
			      size_t count, loff_t * data)
L
Linus Torvalds 已提交
1157
{
L
Len Brown 已提交
1158
	int status;
1159 1160
	struct seq_file *m = file->private_data;
	struct acpi_video_device *dev = m->private;
L
Len Brown 已提交
1161 1162
	char str[12] = { 0 };
	u32 state = 0;
L
Linus Torvalds 已提交
1163 1164 1165


	if (!dev || count + 1 > sizeof str)
1166
		return -EINVAL;
L
Linus Torvalds 已提交
1167 1168

	if (copy_from_user(str, buffer, count))
1169
		return -EFAULT;
L
Linus Torvalds 已提交
1170 1171 1172

	str[count] = 0;
	state = simple_strtoul(str, NULL, 0);
L
Len Brown 已提交
1173
	state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));
L
Linus Torvalds 已提交
1174 1175 1176 1177

	status = acpi_video_device_set_state(dev, state);

	if (status)
1178
		return -EFAULT;
L
Linus Torvalds 已提交
1179

1180
	return count;
L
Linus Torvalds 已提交
1181 1182 1183
}

static int
L
Len Brown 已提交
1184
acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1185
{
1186
	struct acpi_video_device *dev = seq->private;
L
Len Brown 已提交
1187
	int i;
L
Linus Torvalds 已提交
1188 1189 1190 1191


	if (!dev || !dev->brightness) {
		seq_printf(seq, "<not supported>\n");
1192
		return 0;
L
Linus Torvalds 已提交
1193 1194 1195
	}

	seq_printf(seq, "levels: ");
1196
	for (i = 2; i < dev->brightness->count; i++)
L
Linus Torvalds 已提交
1197 1198 1199
		seq_printf(seq, " %d", dev->brightness->levels[i]);
	seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);

1200
	return 0;
L
Linus Torvalds 已提交
1201 1202 1203
}

static int
L
Len Brown 已提交
1204
acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1205 1206 1207 1208 1209 1210
{
	return single_open(file, acpi_video_device_brightness_seq_show,
			   PDE(inode)->data);
}

static ssize_t
L
Len Brown 已提交
1211 1212 1213
acpi_video_device_write_brightness(struct file *file,
				   const char __user * buffer,
				   size_t count, loff_t * data)
L
Linus Torvalds 已提交
1214
{
1215 1216
	struct seq_file *m = file->private_data;
	struct acpi_video_device *dev = m->private;
1217
	char str[5] = { 0 };
L
Len Brown 已提交
1218 1219
	unsigned int level = 0;
	int i;
L
Linus Torvalds 已提交
1220 1221


1222
	if (!dev || !dev->brightness || count + 1 > sizeof str)
1223
		return -EINVAL;
L
Linus Torvalds 已提交
1224 1225

	if (copy_from_user(str, buffer, count))
1226
		return -EFAULT;
L
Linus Torvalds 已提交
1227 1228 1229

	str[count] = 0;
	level = simple_strtoul(str, NULL, 0);
L
Len Brown 已提交
1230

L
Linus Torvalds 已提交
1231
	if (level > 100)
1232
		return -EFAULT;
L
Linus Torvalds 已提交
1233

1234
	/* validate through the list of available levels */
1235
	for (i = 2; i < dev->brightness->count; i++)
L
Linus Torvalds 已提交
1236
		if (level == dev->brightness->levels[i]) {
1237 1238
			if (!acpi_video_device_lcd_set_level(dev, level))
				return count;
L
Linus Torvalds 已提交
1239 1240 1241
			break;
		}

1242
	return -EINVAL;
L
Linus Torvalds 已提交
1243 1244
}

L
Len Brown 已提交
1245
static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1246
{
1247
	struct acpi_video_device *dev = seq->private;
L
Len Brown 已提交
1248 1249 1250
	int status;
	int i;
	union acpi_object *edid = NULL;
L
Linus Torvalds 已提交
1251 1252 1253 1254 1255


	if (!dev)
		goto out;

L
Len Brown 已提交
1256
	status = acpi_video_device_EDID(dev, &edid, 128);
L
Linus Torvalds 已提交
1257
	if (ACPI_FAILURE(status)) {
L
Len Brown 已提交
1258
		status = acpi_video_device_EDID(dev, &edid, 256);
L
Linus Torvalds 已提交
1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269
	}

	if (ACPI_FAILURE(status)) {
		goto out;
	}

	if (edid && edid->type == ACPI_TYPE_BUFFER) {
		for (i = 0; i < edid->buffer.length; i++)
			seq_putc(seq, edid->buffer.pointer[i]);
	}

L
Len Brown 已提交
1270
      out:
L
Linus Torvalds 已提交
1271 1272 1273 1274 1275
	if (!edid)
		seq_printf(seq, "<not supported>\n");
	else
		kfree(edid);

1276
	return 0;
L
Linus Torvalds 已提交
1277 1278 1279
}

static int
L
Len Brown 已提交
1280
acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1281 1282 1283 1284 1285
{
	return single_open(file, acpi_video_device_EDID_seq_show,
			   PDE(inode)->data);
}

L
Len Brown 已提交
1286
static int acpi_video_device_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1287
{
1288
	struct proc_dir_entry *entry, *device_dir;
L
Linus Torvalds 已提交
1289 1290
	struct acpi_video_device *vid_dev;

1291
	vid_dev = acpi_driver_data(device);
L
Linus Torvalds 已提交
1292
	if (!vid_dev)
1293
		return -ENODEV;
L
Linus Torvalds 已提交
1294

1295 1296 1297 1298 1299
	device_dir = proc_mkdir(acpi_device_bid(device),
				vid_dev->video->dir);
	if (!device_dir)
		return -ENOMEM;

L
Linus Torvalds 已提交
1300
	/* 'info' [R] */
1301
	entry = proc_create_data("info", S_IRUGO, device_dir,
1302
			&acpi_video_device_info_fops, acpi_driver_data(device));
L
Linus Torvalds 已提交
1303
	if (!entry)
1304
		goto err_remove_dir;
L
Linus Torvalds 已提交
1305 1306

	/* 'state' [R/W] */
1307
	entry = proc_create_data("state", S_IFREG | S_IRUGO | S_IWUSR,
1308
				 device_dir,
1309 1310
				 &acpi_video_device_state_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1311
	if (!entry)
1312
		goto err_remove_info;
L
Linus Torvalds 已提交
1313 1314

	/* 'brightness' [R/W] */
1315
	entry = proc_create_data("brightness", S_IFREG | S_IRUGO | S_IWUSR,
1316
				 device_dir,
1317 1318
				 &acpi_video_device_brightness_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1319
	if (!entry)
1320
		goto err_remove_state;
L
Linus Torvalds 已提交
1321 1322

	/* 'EDID' [R] */
1323
	entry = proc_create_data("EDID", S_IRUGO, device_dir,
1324 1325
				 &acpi_video_device_EDID_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1326
	if (!entry)
1327
		goto err_remove_brightness;
L
Linus Torvalds 已提交
1328

1329 1330
	acpi_device_dir(device) = device_dir;

1331
	return 0;
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341

 err_remove_brightness:
	remove_proc_entry("brightness", device_dir);
 err_remove_state:
	remove_proc_entry("state", device_dir);
 err_remove_info:
	remove_proc_entry("info", device_dir);
 err_remove_dir:
	remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
	return -ENOMEM;
L
Linus Torvalds 已提交
1342 1343
}

L
Len Brown 已提交
1344
static int acpi_video_device_remove_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1345 1346
{
	struct acpi_video_device *vid_dev;
1347
	struct proc_dir_entry *device_dir;
L
Linus Torvalds 已提交
1348

1349
	vid_dev = acpi_driver_data(device);
L
Linus Torvalds 已提交
1350
	if (!vid_dev || !vid_dev->video || !vid_dev->video->dir)
1351
		return -ENODEV;
L
Linus Torvalds 已提交
1352

1353 1354 1355 1356 1357 1358
	device_dir = acpi_device_dir(device);
	if (device_dir) {
		remove_proc_entry("info", device_dir);
		remove_proc_entry("state", device_dir);
		remove_proc_entry("brightness", device_dir);
		remove_proc_entry("EDID", device_dir);
L
Len Brown 已提交
1359
		remove_proc_entry(acpi_device_bid(device), vid_dev->video->dir);
L
Linus Torvalds 已提交
1360 1361 1362
		acpi_device_dir(device) = NULL;
	}

1363
	return 0;
L
Linus Torvalds 已提交
1364 1365 1366
}

/* video bus */
L
Len Brown 已提交
1367
static int acpi_video_bus_info_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1368
{
1369
	struct acpi_video_bus *video = seq->private;
L
Linus Torvalds 已提交
1370 1371 1372 1373 1374 1375


	if (!video)
		goto end;

	seq_printf(seq, "Switching heads:              %s\n",
L
Len Brown 已提交
1376
		   video->flags.multihead ? "yes" : "no");
L
Linus Torvalds 已提交
1377
	seq_printf(seq, "Video ROM:                    %s\n",
L
Len Brown 已提交
1378
		   video->flags.rom ? "yes" : "no");
L
Linus Torvalds 已提交
1379
	seq_printf(seq, "Device to be POSTed on boot:  %s\n",
L
Len Brown 已提交
1380
		   video->flags.post ? "yes" : "no");
L
Linus Torvalds 已提交
1381

L
Len Brown 已提交
1382
      end:
1383
	return 0;
L
Linus Torvalds 已提交
1384 1385
}

L
Len Brown 已提交
1386
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1387
{
L
Len Brown 已提交
1388 1389
	return single_open(file, acpi_video_bus_info_seq_show,
			   PDE(inode)->data);
L
Linus Torvalds 已提交
1390 1391
}

L
Len Brown 已提交
1392
static int acpi_video_bus_ROM_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1393
{
1394
	struct acpi_video_bus *video = seq->private;
L
Linus Torvalds 已提交
1395 1396 1397 1398 1399


	if (!video)
		goto end;

1400
	printk(KERN_INFO PREFIX "Please implement %s\n", __func__);
L
Linus Torvalds 已提交
1401 1402
	seq_printf(seq, "<TODO>\n");

L
Len Brown 已提交
1403
      end:
1404
	return 0;
L
Linus Torvalds 已提交
1405 1406
}

L
Len Brown 已提交
1407
static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1408 1409 1410 1411
{
	return single_open(file, acpi_video_bus_ROM_seq_show, PDE(inode)->data);
}

L
Len Brown 已提交
1412
static int acpi_video_bus_POST_info_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1413
{
1414
	struct acpi_video_bus *video = seq->private;
1415
	unsigned long long options;
L
Len Brown 已提交
1416
	int status;
L
Linus Torvalds 已提交
1417 1418 1419 1420 1421 1422 1423 1424


	if (!video)
		goto end;

	status = acpi_video_bus_POST_options(video, &options);
	if (ACPI_SUCCESS(status)) {
		if (!(options & 1)) {
L
Len Brown 已提交
1425 1426 1427
			printk(KERN_WARNING PREFIX
			       "The motherboard VGA device is not listed as a possible POST device.\n");
			printk(KERN_WARNING PREFIX
1428
			       "This indicates a BIOS bug. Please contact the manufacturer.\n");
L
Linus Torvalds 已提交
1429
		}
1430
		printk(KERN_WARNING "%llx\n", options);
1431
		seq_printf(seq, "can POST: <integrated video>");
L
Linus Torvalds 已提交
1432 1433 1434 1435 1436 1437 1438
		if (options & 2)
			seq_printf(seq, " <PCI video>");
		if (options & 4)
			seq_printf(seq, " <AGP video>");
		seq_putc(seq, '\n');
	} else
		seq_printf(seq, "<not supported>\n");
L
Len Brown 已提交
1439
      end:
1440
	return 0;
L
Linus Torvalds 已提交
1441 1442 1443
}

static int
L
Len Brown 已提交
1444
acpi_video_bus_POST_info_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1445
{
L
Len Brown 已提交
1446 1447
	return single_open(file, acpi_video_bus_POST_info_seq_show,
			   PDE(inode)->data);
L
Linus Torvalds 已提交
1448 1449
}

L
Len Brown 已提交
1450
static int acpi_video_bus_POST_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1451
{
1452
	struct acpi_video_bus *video = seq->private;
L
Len Brown 已提交
1453
	int status;
1454
	unsigned long long id;
L
Linus Torvalds 已提交
1455 1456 1457 1458 1459


	if (!video)
		goto end;

L
Len Brown 已提交
1460
	status = acpi_video_bus_get_POST(video, &id);
L
Linus Torvalds 已提交
1461 1462 1463 1464
	if (!ACPI_SUCCESS(status)) {
		seq_printf(seq, "<not supported>\n");
		goto end;
	}
1465
	seq_printf(seq, "device POSTed is <%s>\n", device_decode[id & 3]);
L
Linus Torvalds 已提交
1466

L
Len Brown 已提交
1467
      end:
1468
	return 0;
L
Linus Torvalds 已提交
1469 1470
}

L
Len Brown 已提交
1471
static int acpi_video_bus_DOS_seq_show(struct seq_file *seq, void *offset)
L
Linus Torvalds 已提交
1472
{
1473
	struct acpi_video_bus *video = seq->private;
L
Linus Torvalds 已提交
1474 1475


L
Len Brown 已提交
1476
	seq_printf(seq, "DOS setting: <%d>\n", video->dos_setting);
L
Linus Torvalds 已提交
1477

1478
	return 0;
L
Linus Torvalds 已提交
1479 1480
}

L
Len Brown 已提交
1481
static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1482
{
L
Len Brown 已提交
1483 1484
	return single_open(file, acpi_video_bus_POST_seq_show,
			   PDE(inode)->data);
L
Linus Torvalds 已提交
1485 1486
}

L
Len Brown 已提交
1487
static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file)
L
Linus Torvalds 已提交
1488 1489 1490 1491 1492
{
	return single_open(file, acpi_video_bus_DOS_seq_show, PDE(inode)->data);
}

static ssize_t
L
Len Brown 已提交
1493 1494 1495
acpi_video_bus_write_POST(struct file *file,
			  const char __user * buffer,
			  size_t count, loff_t * data)
L
Linus Torvalds 已提交
1496
{
L
Len Brown 已提交
1497
	int status;
1498 1499
	struct seq_file *m = file->private_data;
	struct acpi_video_bus *video = m->private;
L
Len Brown 已提交
1500
	char str[12] = { 0 };
1501
	unsigned long long opt, options;
L
Linus Torvalds 已提交
1502 1503 1504


	if (!video || count + 1 > sizeof str)
1505
		return -EINVAL;
L
Linus Torvalds 已提交
1506 1507 1508

	status = acpi_video_bus_POST_options(video, &options);
	if (!ACPI_SUCCESS(status))
1509
		return -EINVAL;
L
Linus Torvalds 已提交
1510 1511

	if (copy_from_user(str, buffer, count))
1512
		return -EFAULT;
L
Linus Torvalds 已提交
1513 1514 1515 1516

	str[count] = 0;
	opt = strtoul(str, NULL, 0);
	if (opt > 3)
1517
		return -EFAULT;
L
Linus Torvalds 已提交
1518

1519
	/* just in case an OEM 'forgot' the motherboard... */
L
Linus Torvalds 已提交
1520 1521 1522
	options |= 1;

	if (options & (1ul << opt)) {
L
Len Brown 已提交
1523
		status = acpi_video_bus_set_POST(video, opt);
L
Linus Torvalds 已提交
1524
		if (!ACPI_SUCCESS(status))
1525
			return -EFAULT;
L
Linus Torvalds 已提交
1526 1527 1528

	}

1529
	return count;
L
Linus Torvalds 已提交
1530 1531 1532
}

static ssize_t
L
Len Brown 已提交
1533 1534 1535
acpi_video_bus_write_DOS(struct file *file,
			 const char __user * buffer,
			 size_t count, loff_t * data)
L
Linus Torvalds 已提交
1536
{
L
Len Brown 已提交
1537
	int status;
1538 1539
	struct seq_file *m = file->private_data;
	struct acpi_video_bus *video = m->private;
L
Len Brown 已提交
1540 1541
	char str[12] = { 0 };
	unsigned long opt;
L
Linus Torvalds 已提交
1542 1543 1544


	if (!video || count + 1 > sizeof str)
1545
		return -EINVAL;
L
Linus Torvalds 已提交
1546 1547

	if (copy_from_user(str, buffer, count))
1548
		return -EFAULT;
L
Linus Torvalds 已提交
1549 1550 1551 1552

	str[count] = 0;
	opt = strtoul(str, NULL, 0);
	if (opt > 7)
1553
		return -EFAULT;
L
Linus Torvalds 已提交
1554

L
Len Brown 已提交
1555
	status = acpi_video_bus_DOS(video, opt & 0x3, (opt & 0x4) >> 2);
L
Linus Torvalds 已提交
1556 1557

	if (!ACPI_SUCCESS(status))
1558
		return -EFAULT;
L
Linus Torvalds 已提交
1559

1560
	return count;
L
Linus Torvalds 已提交
1561 1562
}

L
Len Brown 已提交
1563
static int acpi_video_bus_add_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1564
{
1565 1566 1567
	struct acpi_video_bus *video = acpi_driver_data(device);
	struct proc_dir_entry *device_dir;
	struct proc_dir_entry *entry;
L
Linus Torvalds 已提交
1568

1569 1570 1571
	device_dir = proc_mkdir(acpi_device_bid(device), acpi_video_dir);
	if (!device_dir)
		return -ENOMEM;
L
Linus Torvalds 已提交
1572 1573

	/* 'info' [R] */
1574
	entry = proc_create_data("info", S_IRUGO, device_dir,
1575 1576
				 &acpi_video_bus_info_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1577
	if (!entry)
1578
		goto err_remove_dir;
L
Linus Torvalds 已提交
1579 1580

	/* 'ROM' [R] */
1581
	entry = proc_create_data("ROM", S_IRUGO, device_dir,
1582 1583
				 &acpi_video_bus_ROM_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1584
	if (!entry)
1585
		goto err_remove_info;
L
Linus Torvalds 已提交
1586 1587

	/* 'POST_info' [R] */
1588
	entry = proc_create_data("POST_info", S_IRUGO, device_dir,
1589 1590
				 &acpi_video_bus_POST_info_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1591
	if (!entry)
1592
		goto err_remove_rom;
L
Linus Torvalds 已提交
1593 1594

	/* 'POST' [R/W] */
1595
	entry = proc_create_data("POST", S_IFREG | S_IRUGO | S_IWUSR,
1596
				 device_dir,
1597 1598
				 &acpi_video_bus_POST_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1599
	if (!entry)
1600
		goto err_remove_post_info;
L
Linus Torvalds 已提交
1601 1602

	/* 'DOS' [R/W] */
1603
	entry = proc_create_data("DOS", S_IFREG | S_IRUGO | S_IWUSR,
1604
				 device_dir,
1605 1606
				 &acpi_video_bus_DOS_fops,
				 acpi_driver_data(device));
L
Linus Torvalds 已提交
1607
	if (!entry)
1608
		goto err_remove_post;
L
Linus Torvalds 已提交
1609

1610
	video->dir = acpi_device_dir(device) = device_dir;
1611
	return 0;
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623

 err_remove_post:
	remove_proc_entry("POST", device_dir);
 err_remove_post_info:
	remove_proc_entry("POST_info", device_dir);
 err_remove_rom:
	remove_proc_entry("ROM", device_dir);
 err_remove_info:
	remove_proc_entry("info", device_dir);
 err_remove_dir:
	remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
	return -ENOMEM;
L
Linus Torvalds 已提交
1624 1625
}

L
Len Brown 已提交
1626
static int acpi_video_bus_remove_fs(struct acpi_device *device)
L
Linus Torvalds 已提交
1627
{
1628 1629 1630 1631 1632 1633 1634 1635
	struct proc_dir_entry *device_dir = acpi_device_dir(device);

	if (device_dir) {
		remove_proc_entry("info", device_dir);
		remove_proc_entry("ROM", device_dir);
		remove_proc_entry("POST_info", device_dir);
		remove_proc_entry("POST", device_dir);
		remove_proc_entry("DOS", device_dir);
L
Len Brown 已提交
1636
		remove_proc_entry(acpi_device_bid(device), acpi_video_dir);
L
Linus Torvalds 已提交
1637 1638 1639
		acpi_device_dir(device) = NULL;
	}

1640
	return 0;
L
Linus Torvalds 已提交
1641 1642 1643 1644 1645 1646 1647
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

/* device interface */
1648 1649 1650
static struct acpi_video_device_attrib*
acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
{
1651 1652 1653 1654 1655 1656 1657 1658
	struct acpi_video_enumerated_device *ids;
	int i;

	for (i = 0; i < video->attached_count; i++) {
		ids = &video->attached_array[i];
		if ((ids->value.int_val & 0xffff) == device_id)
			return &ids->value.attrib;
	}
1659 1660 1661

	return NULL;
}
L
Linus Torvalds 已提交
1662 1663

static int
L
Len Brown 已提交
1664 1665
acpi_video_bus_get_one_device(struct acpi_device *device,
			      struct acpi_video_bus *video)
L
Linus Torvalds 已提交
1666
{
1667
	unsigned long long device_id;
1668
	int status;
L
Len Brown 已提交
1669
	struct acpi_video_device *data;
1670
	struct acpi_video_device_attrib* attribute;
L
Linus Torvalds 已提交
1671 1672

	if (!device || !video)
1673
		return -EINVAL;
L
Linus Torvalds 已提交
1674

L
Len Brown 已提交
1675 1676
	status =
	    acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
L
Linus Torvalds 已提交
1677 1678
	if (ACPI_SUCCESS(status)) {

1679
		data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
L
Linus Torvalds 已提交
1680
		if (!data)
1681
			return -ENOMEM;
L
Linus Torvalds 已提交
1682 1683 1684

		strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
		strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1685
		device->driver_data = data;
L
Linus Torvalds 已提交
1686 1687 1688 1689 1690

		data->device_id = device_id;
		data->video = video;
		data->dev = device;

1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713
		attribute = acpi_video_get_device_attr(video, device_id);

		if((attribute != NULL) && attribute->device_id_scheme) {
			switch (attribute->display_type) {
			case ACPI_VIDEO_DISPLAY_CRT:
				data->flags.crt = 1;
				break;
			case ACPI_VIDEO_DISPLAY_TV:
				data->flags.tvout = 1;
				break;
			case ACPI_VIDEO_DISPLAY_DVI:
				data->flags.dvi = 1;
				break;
			case ACPI_VIDEO_DISPLAY_LCD:
				data->flags.lcd = 1;
				break;
			default:
				data->flags.unknown = 1;
				break;
			}
			if(attribute->bios_can_detect)
				data->flags.bios = 1;
		} else
L
Linus Torvalds 已提交
1714
			data->flags.unknown = 1;
L
Len Brown 已提交
1715

L
Linus Torvalds 已提交
1716 1717 1718
		acpi_video_device_bind(video, data);
		acpi_video_device_find_cap(data);

1719
		status = acpi_install_notify_handler(device->handle,
L
Len Brown 已提交
1720 1721 1722
						     ACPI_DEVICE_NOTIFY,
						     acpi_video_device_notify,
						     data);
L
Linus Torvalds 已提交
1723
		if (ACPI_FAILURE(status)) {
1724 1725
			printk(KERN_ERR PREFIX
					  "Error installing notify handler\n");
1726 1727 1728 1729 1730
			if(data->brightness)
				kfree(data->brightness->levels);
			kfree(data->brightness);
			kfree(data);
			return -ENODEV;
L
Linus Torvalds 已提交
1731 1732
		}

1733
		mutex_lock(&video->device_list_lock);
L
Linus Torvalds 已提交
1734
		list_add_tail(&data->entry, &video->video_device_list);
1735
		mutex_unlock(&video->device_list_lock);
L
Linus Torvalds 已提交
1736 1737 1738

		acpi_video_device_add_fs(device);

1739
		return 0;
L
Linus Torvalds 已提交
1740 1741
	}

1742
	return -ENOENT;
L
Linus Torvalds 已提交
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
}

/*
 *  Arg:
 *  	video	: video bus device 
 *
 *  Return:
 *  	none
 *  
 *  Enumerate the video device list of the video bus, 
 *  bind the ids with the corresponding video devices
 *  under the video bus.
L
Len Brown 已提交
1755
 */
L
Linus Torvalds 已提交
1756

L
Len Brown 已提交
1757
static void acpi_video_device_rebind(struct acpi_video_bus *video)
L
Linus Torvalds 已提交
1758
{
1759 1760
	struct acpi_video_device *dev;

1761
	mutex_lock(&video->device_list_lock);
1762 1763

	list_for_each_entry(dev, &video->video_device_list, entry)
L
Len Brown 已提交
1764
		acpi_video_device_bind(video, dev);
1765

1766
	mutex_unlock(&video->device_list_lock);
L
Linus Torvalds 已提交
1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779
}

/*
 *  Arg:
 *  	video	: video bus device 
 *  	device	: video output device under the video 
 *  		bus
 *
 *  Return:
 *  	none
 *  
 *  Bind the ids with the corresponding video devices
 *  under the video bus.
L
Len Brown 已提交
1780
 */
L
Linus Torvalds 已提交
1781 1782

static void
L
Len Brown 已提交
1783 1784
acpi_video_device_bind(struct acpi_video_bus *video,
		       struct acpi_video_device *device)
L
Linus Torvalds 已提交
1785
{
1786
	struct acpi_video_enumerated_device *ids;
L
Len Brown 已提交
1787
	int i;
L
Linus Torvalds 已提交
1788

1789 1790 1791 1792
	for (i = 0; i < video->attached_count; i++) {
		ids = &video->attached_array[i];
		if (device->device_id == (ids->value.int_val & 0xffff)) {
			ids->bind_info = device;
L
Linus Torvalds 已提交
1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
			ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
		}
	}
}

/*
 *  Arg:
 *  	video	: video bus device 
 *
 *  Return:
 *  	< 0	: error
 *  
 *  Call _DOD to enumerate all devices attached to display adapter
 *
L
Len Brown 已提交
1807
 */
L
Linus Torvalds 已提交
1808 1809 1810

static int acpi_video_device_enumerate(struct acpi_video_bus *video)
{
L
Len Brown 已提交
1811 1812 1813
	int status;
	int count;
	int i;
1814
	struct acpi_video_enumerated_device *active_list;
L
Len Brown 已提交
1815 1816 1817
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *dod = NULL;
	union acpi_object *obj;
L
Linus Torvalds 已提交
1818

1819
	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
L
Linus Torvalds 已提交
1820
	if (!ACPI_SUCCESS(status)) {
1821
		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
1822
		return status;
L
Linus Torvalds 已提交
1823 1824
	}

1825
	dod = buffer.pointer;
L
Linus Torvalds 已提交
1826
	if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
1827
		ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
L
Linus Torvalds 已提交
1828 1829 1830 1831 1832
		status = -EFAULT;
		goto out;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
L
Len Brown 已提交
1833
			  dod->package.count));
L
Linus Torvalds 已提交
1834

1835 1836 1837 1838
	active_list = kcalloc(1 + dod->package.count,
			      sizeof(struct acpi_video_enumerated_device),
			      GFP_KERNEL);
	if (!active_list) {
L
Linus Torvalds 已提交
1839 1840 1841 1842 1843 1844
		status = -ENOMEM;
		goto out;
	}

	count = 0;
	for (i = 0; i < dod->package.count; i++) {
1845
		obj = &dod->package.elements[i];
L
Linus Torvalds 已提交
1846 1847

		if (obj->type != ACPI_TYPE_INTEGER) {
1848 1849 1850
			printk(KERN_ERR PREFIX
				"Invalid _DOD data in element %d\n", i);
			continue;
L
Linus Torvalds 已提交
1851
		}
1852 1853 1854

		active_list[count].value.int_val = obj->integer.value;
		active_list[count].bind_info = NULL;
L
Len Brown 已提交
1855 1856
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
				  (int)obj->integer.value));
L
Linus Torvalds 已提交
1857 1858 1859
		count++;
	}

1860
	kfree(video->attached_array);
L
Len Brown 已提交
1861

1862
	video->attached_array = active_list;
L
Linus Torvalds 已提交
1863
	video->attached_count = count;
1864 1865

 out:
1866
	kfree(buffer.pointer);
1867
	return status;
L
Linus Torvalds 已提交
1868 1869
}

L
Len Brown 已提交
1870 1871 1872
static int
acpi_video_get_next_level(struct acpi_video_device *device,
			  u32 level_current, u32 event)
L
Linus Torvalds 已提交
1873
{
1874
	int min, max, min_above, max_below, i, l, delta = 255;
1875 1876
	max = max_below = 0;
	min = min_above = 255;
1877
	/* Find closest level to level_current */
1878
	for (i = 2; i < device->brightness->count; i++) {
1879 1880 1881 1882 1883 1884 1885 1886 1887
		l = device->brightness->levels[i];
		if (abs(l - level_current) < abs(delta)) {
			delta = l - level_current;
			if (!delta)
				break;
		}
	}
	/* Ajust level_current to closest available level */
	level_current += delta;
1888
	for (i = 2; i < device->brightness->count; i++) {
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912
		l = device->brightness->levels[i];
		if (l < min)
			min = l;
		if (l > max)
			max = l;
		if (l < min_above && l > level_current)
			min_above = l;
		if (l > max_below && l < level_current)
			max_below = l;
	}

	switch (event) {
	case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
		return (level_current < max) ? min_above : min;
	case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
		return (level_current < max) ? min_above : max;
	case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
		return (level_current > min) ? max_below : min;
	case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
	case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
		return 0;
	default:
		return level_current;
	}
L
Linus Torvalds 已提交
1913 1914
}

1915
static int
L
Len Brown 已提交
1916
acpi_video_switch_brightness(struct acpi_video_device *device, int event)
L
Linus Torvalds 已提交
1917
{
1918
	unsigned long long level_current, level_next;
1919 1920
	int result = -EINVAL;

1921
	if (!device->brightness)
1922 1923 1924 1925 1926 1927 1928
		goto out;

	result = acpi_video_device_lcd_get_level_current(device,
							 &level_current);
	if (result)
		goto out;

L
Linus Torvalds 已提交
1929
	level_next = acpi_video_get_next_level(device, level_current, event);
1930

1931
	result = acpi_video_device_lcd_set_level(device, level_next);
1932 1933 1934 1935 1936 1937

out:
	if (result)
		printk(KERN_ERR PREFIX "Failed to switch the brightness\n");

	return result;
L
Linus Torvalds 已提交
1938 1939 1940
}

static int
L
Len Brown 已提交
1941 1942
acpi_video_bus_get_devices(struct acpi_video_bus *video,
			   struct acpi_device *device)
L
Linus Torvalds 已提交
1943
{
L
Len Brown 已提交
1944
	int status = 0;
1945
	struct acpi_device *dev;
L
Linus Torvalds 已提交
1946 1947 1948

	acpi_video_device_enumerate(video);

1949
	list_for_each_entry(dev, &device->children, node) {
L
Linus Torvalds 已提交
1950 1951 1952

		status = acpi_video_bus_get_one_device(dev, video);
		if (ACPI_FAILURE(status)) {
1953 1954
			printk(KERN_WARNING PREFIX
					"Cant attach device");
L
Linus Torvalds 已提交
1955 1956 1957
			continue;
		}
	}
1958
	return status;
L
Linus Torvalds 已提交
1959 1960
}

L
Len Brown 已提交
1961
static int acpi_video_bus_put_one_device(struct acpi_video_device *device)
L
Linus Torvalds 已提交
1962
{
1963
	acpi_status status;
L
Linus Torvalds 已提交
1964 1965 1966 1967
	struct acpi_video_bus *video;


	if (!device || !device->video)
1968
		return -ENOENT;
L
Linus Torvalds 已提交
1969 1970 1971 1972 1973

	video = device->video;

	acpi_video_device_remove_fs(device->dev);

1974
	status = acpi_remove_notify_handler(device->dev->handle,
L
Len Brown 已提交
1975 1976
					    ACPI_DEVICE_NOTIFY,
					    acpi_video_device_notify);
1977
	backlight_device_unregister(device->backlight);
1978 1979 1980 1981 1982 1983 1984 1985
	if (device->cdev) {
		sysfs_remove_link(&device->dev->dev.kobj,
				  "thermal_cooling");
		sysfs_remove_link(&device->cdev->device.kobj,
				  "device");
		thermal_cooling_device_unregister(device->cdev);
		device->cdev = NULL;
	}
1986
	video_output_unregister(device->output_dev);
1987

1988
	return 0;
L
Linus Torvalds 已提交
1989 1990
}

L
Len Brown 已提交
1991
static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
L
Linus Torvalds 已提交
1992
{
L
Len Brown 已提交
1993
	int status;
1994
	struct acpi_video_device *dev, *next;
L
Linus Torvalds 已提交
1995

1996
	mutex_lock(&video->device_list_lock);
L
Linus Torvalds 已提交
1997

1998
	list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
L
Linus Torvalds 已提交
1999

2000
		status = acpi_video_bus_put_one_device(dev);
L
Len Brown 已提交
2001 2002 2003
		if (ACPI_FAILURE(status))
			printk(KERN_WARNING PREFIX
			       "hhuuhhuu bug in acpi video driver.\n");
L
Linus Torvalds 已提交
2004

2005 2006 2007 2008 2009 2010
		if (dev->brightness) {
			kfree(dev->brightness->levels);
			kfree(dev->brightness);
		}
		list_del(&dev->entry);
		kfree(dev);
L
Linus Torvalds 已提交
2011 2012
	}

2013
	mutex_unlock(&video->device_list_lock);
2014

2015
	return 0;
L
Linus Torvalds 已提交
2016 2017 2018 2019
}

/* acpi_video interface */

L
Len Brown 已提交
2020
static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
L
Linus Torvalds 已提交
2021
{
2022
	return acpi_video_bus_DOS(video, 0, 0);
L
Linus Torvalds 已提交
2023 2024
}

L
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2025
static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
L
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2026 2027 2028 2029
{
	return acpi_video_bus_DOS(video, 0, 1);
}

2030
static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
L
Linus Torvalds 已提交
2031
{
2032
	struct acpi_video_bus *video = acpi_driver_data(device);
2033 2034 2035
	struct input_dev *input;
	int keycode;

L
Linus Torvalds 已提交
2036
	if (!video)
2037
		return;
L
Linus Torvalds 已提交
2038

2039
	input = video->input;
L
Linus Torvalds 已提交
2040 2041

	switch (event) {
2042
	case ACPI_VIDEO_NOTIFY_SWITCH:	/* User requested a switch,
L
Linus Torvalds 已提交
2043
					 * most likely via hotkey. */
2044
		acpi_bus_generate_proc_event(device, event, 0);
2045
		keycode = KEY_SWITCHVIDEOMODE;
L
Linus Torvalds 已提交
2046 2047
		break;

2048
	case ACPI_VIDEO_NOTIFY_PROBE:	/* User plugged in or removed a video
L
Linus Torvalds 已提交
2049 2050 2051
					 * connector. */
		acpi_video_device_enumerate(video);
		acpi_video_device_rebind(video);
2052
		acpi_bus_generate_proc_event(device, event, 0);
2053
		keycode = KEY_SWITCHVIDEOMODE;
L
Linus Torvalds 已提交
2054 2055
		break;

L
Len Brown 已提交
2056
	case ACPI_VIDEO_NOTIFY_CYCLE:	/* Cycle Display output hotkey pressed. */
L
Len Brown 已提交
2057
		acpi_bus_generate_proc_event(device, event, 0);
2058 2059
		keycode = KEY_SWITCHVIDEOMODE;
		break;
L
Len Brown 已提交
2060
	case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT:	/* Next Display output hotkey pressed. */
L
Len Brown 已提交
2061
		acpi_bus_generate_proc_event(device, event, 0);
2062 2063
		keycode = KEY_VIDEO_NEXT;
		break;
L
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2064
	case ACPI_VIDEO_NOTIFY_PREV_OUTPUT:	/* previous Display output hotkey pressed. */
2065
		acpi_bus_generate_proc_event(device, event, 0);
2066
		keycode = KEY_VIDEO_PREV;
L
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2067 2068 2069
		break;

	default:
2070
		keycode = KEY_UNKNOWN;
L
Linus Torvalds 已提交
2071
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
Len Brown 已提交
2072
				  "Unsupported event [0x%x]\n", event));
L
Linus Torvalds 已提交
2073 2074 2075
		break;
	}

2076
	acpi_notifier_call_chain(device, event, 0);
2077 2078 2079 2080 2081
	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);

2082
	return;
L
Linus Torvalds 已提交
2083 2084
}

L
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2085
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
L
Linus Torvalds 已提交
2086
{
2087
	struct acpi_video_device *video_device = data;
L
Len Brown 已提交
2088
	struct acpi_device *device = NULL;
2089 2090 2091
	struct acpi_video_bus *bus;
	struct input_dev *input;
	int keycode;
L
Linus Torvalds 已提交
2092 2093

	if (!video_device)
2094
		return;
L
Linus Torvalds 已提交
2095

2096
	device = video_device->dev;
2097 2098
	bus = video_device->video;
	input = bus->input;
L
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2099 2100

	switch (event) {
L
Len Brown 已提交
2101
	case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:	/* Cycle brightness */
2102 2103
		if (brightness_switch_enabled)
			acpi_video_switch_brightness(video_device, event);
2104
		acpi_bus_generate_proc_event(device, event, 0);
2105 2106
		keycode = KEY_BRIGHTNESS_CYCLE;
		break;
L
Len Brown 已提交
2107
	case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:	/* Increase brightness */
2108 2109
		if (brightness_switch_enabled)
			acpi_video_switch_brightness(video_device, event);
L
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2110
		acpi_bus_generate_proc_event(device, event, 0);
2111 2112
		keycode = KEY_BRIGHTNESSUP;
		break;
L
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2113
	case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:	/* Decrease brightness */
2114 2115
		if (brightness_switch_enabled)
			acpi_video_switch_brightness(video_device, event);
L
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2116
		acpi_bus_generate_proc_event(device, event, 0);
2117 2118
		keycode = KEY_BRIGHTNESSDOWN;
		break;
L
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2119
	case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:	/* zero brightnesss */
2120 2121
		if (brightness_switch_enabled)
			acpi_video_switch_brightness(video_device, event);
L
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2122
		acpi_bus_generate_proc_event(device, event, 0);
2123 2124
		keycode = KEY_BRIGHTNESS_ZERO;
		break;
L
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2125
	case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:	/* display device off */
2126 2127
		if (brightness_switch_enabled)
			acpi_video_switch_brightness(video_device, event);
2128
		acpi_bus_generate_proc_event(device, event, 0);
2129
		keycode = KEY_DISPLAY_OFF;
L
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2130 2131
		break;
	default:
2132
		keycode = KEY_UNKNOWN;
L
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2133
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
L
Len Brown 已提交
2134
				  "Unsupported event [0x%x]\n", event));
L
Linus Torvalds 已提交
2135 2136
		break;
	}
2137

2138
	acpi_notifier_call_chain(device, event, 0);
2139 2140 2141 2142 2143
	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);

2144
	return;
L
Linus Torvalds 已提交
2145 2146
}

2147
static int instance;
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166
static int acpi_video_resume(struct acpi_device *device)
{
	struct acpi_video_bus *video;
	struct acpi_video_device *video_device;
	int i;

	if (!device || !acpi_driver_data(device))
		return -EINVAL;

	video = acpi_driver_data(device);

	for (i = 0; i < video->attached_count; i++) {
		video_device = video->attached_array[i].bind_info;
		if (video_device && video_device->backlight)
			acpi_video_set_brightness(video_device->backlight);
	}
	return AE_OK;
}

L
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2167
static int acpi_video_bus_add(struct acpi_device *device)
L
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2168
{
2169
	struct acpi_video_bus *video;
2170
	struct input_dev *input;
2171
	int error;
L
Linus Torvalds 已提交
2172

2173
	video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
L
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2174
	if (!video)
2175
		return -ENOMEM;
L
Linus Torvalds 已提交
2176

2177 2178 2179 2180 2181 2182
	/* a hack to fix the duplicate name "VID" problem on T61 */
	if (!strcmp(device->pnp.bus_id, "VID")) {
		if (instance)
			device->pnp.bus_id[3] = '0' + instance;
		instance ++;
	}
2183 2184 2185 2186 2187 2188
	/* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
	if (!strcmp(device->pnp.bus_id, "VGA")) {
		if (instance)
			device->pnp.bus_id[3] = '0' + instance;
		instance++;
	}
2189

2190
	video->device = device;
L
Linus Torvalds 已提交
2191 2192
	strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
	strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
2193
	device->driver_data = video;
L
Linus Torvalds 已提交
2194 2195

	acpi_video_bus_find_cap(video);
2196 2197 2198
	error = acpi_video_bus_check(video);
	if (error)
		goto err_free_video;
L
Linus Torvalds 已提交
2199

2200 2201 2202
	error = acpi_video_bus_add_fs(device);
	if (error)
		goto err_free_video;
L
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2203

2204
	mutex_init(&video->device_list_lock);
L
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2205 2206 2207 2208 2209
	INIT_LIST_HEAD(&video->video_device_list);

	acpi_video_bus_get_devices(video, device);
	acpi_video_bus_start_devices(video);

2210
	video->input = input = input_allocate_device();
2211 2212
	if (!input) {
		error = -ENOMEM;
2213
		goto err_stop_video;
2214
	}
2215 2216 2217 2218 2219 2220 2221 2222

	snprintf(video->phys, sizeof(video->phys),
		"%s/video/input0", acpi_device_hid(video->device));

	input->name = acpi_device_name(video->device);
	input->phys = video->phys;
	input->id.bustype = BUS_HOST;
	input->id.product = 0x06;
2223
	input->dev.parent = &device->dev;
2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234
	input->evbit[0] = BIT(EV_KEY);
	set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
	set_bit(KEY_VIDEO_NEXT, input->keybit);
	set_bit(KEY_VIDEO_PREV, input->keybit);
	set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
	set_bit(KEY_BRIGHTNESSUP, input->keybit);
	set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
	set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
	set_bit(KEY_DISPLAY_OFF, input->keybit);
	set_bit(KEY_UNKNOWN, input->keybit);

2235 2236 2237
	error = input_register_device(input);
	if (error)
		goto err_free_input_dev;
2238

L
Linus Torvalds 已提交
2239
	printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s  rom: %s  post: %s)\n",
L
Len Brown 已提交
2240 2241 2242 2243
	       ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
	       video->flags.multihead ? "yes" : "no",
	       video->flags.rom ? "yes" : "no",
	       video->flags.post ? "yes" : "no");
L
Linus Torvalds 已提交
2244

2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255
	return 0;

 err_free_input_dev:
	input_free_device(input);
 err_stop_video:
	acpi_video_bus_stop_devices(video);
	acpi_video_bus_put_devices(video);
	kfree(video->attached_array);
	acpi_video_bus_remove_fs(device);
 err_free_video:
	kfree(video);
2256
	device->driver_data = NULL;
L
Linus Torvalds 已提交
2257

2258
	return error;
L
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2259 2260
}

L
Len Brown 已提交
2261
static int acpi_video_bus_remove(struct acpi_device *device, int type)
L
Linus Torvalds 已提交
2262
{
L
Len Brown 已提交
2263
	struct acpi_video_bus *video = NULL;
L
Linus Torvalds 已提交
2264 2265 2266


	if (!device || !acpi_driver_data(device))
2267
		return -EINVAL;
L
Linus Torvalds 已提交
2268

2269
	video = acpi_driver_data(device);
L
Linus Torvalds 已提交
2270 2271 2272 2273 2274

	acpi_video_bus_stop_devices(video);
	acpi_video_bus_put_devices(video);
	acpi_video_bus_remove_fs(device);

2275
	input_unregister_device(video->input);
2276
	kfree(video->attached_array);
L
Linus Torvalds 已提交
2277 2278
	kfree(video);

2279
	return 0;
L
Linus Torvalds 已提交
2280 2281
}

2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
static int __init intel_opregion_present(void)
{
#if defined(CONFIG_DRM_I915) || defined(CONFIG_DRM_I915_MODULE)
	struct pci_dev *dev = NULL;
	u32 address;

	for_each_pci_dev(dev) {
		if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
			continue;
		if (dev->vendor != PCI_VENDOR_ID_INTEL)
			continue;
		pci_read_config_dword(dev, 0xfc, &address);
		if (!address)
			continue;
		return 1;
	}
#endif
	return 0;
}

int acpi_video_register(void)
L
Linus Torvalds 已提交
2303
{
L
Len Brown 已提交
2304
	int result = 0;
L
Linus Torvalds 已提交
2305 2306 2307

	acpi_video_dir = proc_mkdir(ACPI_VIDEO_CLASS, acpi_root_dir);
	if (!acpi_video_dir)
2308
		return -ENODEV;
L
Linus Torvalds 已提交
2309 2310 2311 2312

	result = acpi_bus_register_driver(&acpi_video_bus);
	if (result < 0) {
		remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);
2313
		return -ENODEV;
L
Linus Torvalds 已提交
2314 2315
	}

2316
	return 0;
L
Linus Torvalds 已提交
2317
}
2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
EXPORT_SYMBOL(acpi_video_register);

/*
 * This is kind of nasty. Hardware using Intel chipsets may require
 * the video opregion code to be run first in order to initialise
 * state before any ACPI video calls are made. To handle this we defer
 * registration of the video class until the opregion code has run.
 */

static int __init acpi_video_init(void)
{
2329 2330
	dmi_check_system(video_dmi_table);

2331 2332 2333 2334 2335
	if (intel_opregion_present())
		return 0;

	return acpi_video_register();
}
L
Linus Torvalds 已提交
2336

2337
void acpi_video_exit(void)
L
Linus Torvalds 已提交
2338 2339 2340 2341 2342 2343
{

	acpi_bus_unregister_driver(&acpi_video_bus);

	remove_proc_entry(ACPI_VIDEO_CLASS, acpi_root_dir);

2344
	return;
L
Linus Torvalds 已提交
2345
}
2346
EXPORT_SYMBOL(acpi_video_exit);
L
Linus Torvalds 已提交
2347 2348 2349

module_init(acpi_video_init);
module_exit(acpi_video_exit);